Ans. Example: in tomato, oxalic acid is present , in apple, malic acid and in lemon, we have citric acid and so many other acids are present in different organic substances. Give reason for your answer.  (2013) Magnesium hydroxide Mg(OH)2. In which test tube will the fizzing occur more vigorously and why? See Video Explanation of Acids Bases and Salts, Ph and its biological importance, indicators, Also See: CBSE Class 10 Science Syllabus 2019-2020 Session. 3. } If you have any doubts, please comment below. Chemical properties of bases Name the plant & its division for which litmus can be extracted? Answer: The water molecules, which form part of the structure of a crystal, are called water of crystallization. Product: Plaster of Paris and water of salt content. But in terms of chemicals, we relate nature either with acidic, basic or neutral nature. (ii) Solution A has more H+ ion concentration because higher the hydronium ion concentration, lower is the pH value. The bases that are soluble in water are called alkalis. Answer: (a) NaCl Your No1 source for On the other hand, carbonic acid is a weak acid which is only slightly ionised and hence gives a small amount of hydrogen ions [H+ (aq)]. Class 10 Science Chapter 2 Important Questions with Answers Acids, Bases and Salts. Give reason for your answer. 21. Write balanced chemical equations for both the changes observed. (b) (i) Being alkaline, sodium hydrogen carbonate (baking soda) neutralises the excess acid present in the stomach and relieves indigestion. They are bitter. The best app for CBSE students now provides Acids Bases and Salts class 10 Notes latest chapter wise notes for quick preparation of CBSE board exams and school based annual examinations. [CDATA[ Give two important uses of washing soda and baking soda. (d) 4 (i) Identify the acidic and basic solution. Question 6. (c) 1 2. it is used in baking cakes, etc - in cakes baking powder is added that contains baking soda and tartaric acid. Ans. Back to Lesson Acid vs Base: Acid Base Contains H+ /H3O+ ions in aqueous solution Contains OH- ions in aqueous solution Turns blue litmus paper LearnFatafat CBSE class 10 science course offers acids bases and salts class 10 notes for chapter 2. What is the difference b/w dilute HCl & concentrate HCl? Ans.Acid turns litmus from blue to red & phenolphthalein from pink to colourless. As the acid is strong, therefore, strong character is retained in the salt that is why it comes out to be acidic This reaction is regarded as neutralization reaction as salt formed is neither acidic nor basic its neutral, 5. At That Ph Acid Reacts With Calcium Phosphate Of Tooth Enamel And Cause Its Corrosion. Kerala Syllabus 9th Standard Physics Solutions Guide, Kerala Syllabus 9th Standard Biology Solutions Guide, Class 10 Science Chapter 2 Important Questions with Answers Acids, Bases and Salts, Acids, Bases and Salts Class 10 Important Questions Very Short Answer Type, Acids, Bases and Salts Class 10 Important Questions Short Answer Type I, Acids, Bases and Salts Class 10 Important Questions Short Answer Type II, Acids, Bases and Salts Class 10 Important Questions Long Answer Type, NCERT Solutions for Class 7 Social Science History Chapter 5 Rulers and Buildings, NCERT Solutions for Class 7 Social Science History Chapter 3 The Delhi Sultans, NCERT Solutions for Class 7 Social Science History Chapter 4 The Mughal Empire, NCERT Solutions for Class 7 Social Science History Chapter 2 New Kings and Kingdoms, NCERT Solutions for Class 7 Social Science History Chapter 1 Tracing Changes Through a Thousand Years, NCERT Solutions for Class 8 Social Science Civics Chapter 10 Law and Social Justice, NCERT Solutions for Class 6 English A Pact with the Sun Chapter 10 A Strange Wrestling Match, Unseen Passage For Class 12 With Answers PDF 2020 – Literary Passages, Unseen Passage For Class 12 With Answers PDF 2020 – Factual and Descriptive Passages, NCERT Solutions for Class 8 Social Science Civics Chapter 9 Public Facilities, NCERT Solutions for Class 6 English A Pact with the Sun Chapter 9 What Happened to the Reptiles, NCERT Solutions for Class 8 Social Science Civics Chapter 8 Confronting Marginalisation, NCERT Solutions for Class 6 English A Pact with the Sun Chapter 8 A Pact with the Sun, NCERT Solutions for Class 6 English A Pact with the Sun Chapter 7 The Wonder Called Sleep, Washing soda crystals contain 10 molecules of water (Na, Plaster of Paris crystals contain 1/2 molecule of water (CaSO, An acid is a substance which dissociates on dissolving in water to produce hydrogen ions [H, Hydrogen ions do not exist as H+ ions in a solution, they attach themselves to the polar water molecules to form hydronium ions, H, When a solution of an acid is diluted, the number of [H. Acids react with bases to form salt and water (neutralization reaction). 2. (c) strongly acidic? By doing so, the heat released is comparatively less and  is (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. Cl2 gas is given off at the anode and H2 gas at the cathode while sodium hydroxide solution is formed near the cathode. Question 4. Weak Acid is the acid that partially dissociates into hydrogen ions. pH>7. 1. However, when HCl gas dissolves in water, it forms hydrogen ions and hence shows acidic behaviour. Ans. Explain your answer. This process is called Chlor-alkali process because the products formed are chlorine and alkali NaOH. Ph scale consist of scale ranging from 0 to 14 . Solution with pH=11,12,13,14 are strong base. With examples.  (2014) Q9. Ans.In dilute HCl → amount of H2O is more 33.Which gas is liberated when acids react with metal carbonates? Sting of yellow weeps can be neutralized by rubbing acetic acid (vinegar). } 3. CaCO3→CaO+CO2 A.  Fizzing will occur more vigorously in test tube B because in it carbon dioxide is evolved that escapes with fizz . Thus, A will have pH more than 7 because pH value of. 6.6, it turns sour. NCERT Extra Questions for Class 10 Science Chapter 2 Acids, Bases and Salts with Answers will help to score more marks in your CBSE Board Exams. Preparation : Q1. Solution B: pH = 8 Properties of acids. Bacteria present in the mouth produce acids by the degradation of sugar and food particles remaining in the mouth after eating. 2. For Example, Sulphuric Acid, Hydrochloric Acid etc. The dry HCl does not change the colour of dry litmus paper as it needs moisture or water for its acidic action. Test tube ‘A’ Na2CO3 (s) + 2HCl (aq) → 2NaCl (aq) + CO2 (g) + H2O (l) (ii) as a constituent of baking powder.  (2014) Both  phosphoric & carbonic acid are weak acids. It is Formed When Strong Base Reacts With weak acid Q13. The salts of strong acids and weak bases give acidic solution having pH less than 7. Importance of Ph When We Eat Some Sugary Substance The Acids Production Is Stimulated That Corrode Enamel. A reaction of an acid and base to form salt & water is called a neutralization reaction. pH of solution A = 3, Bases are those substances which when dissolved in water gives OH- ions. (2013) (iii) Tooth decay starts when the pH of the mouth is lower than 5.5. Hence, they do not conduct electricity. The first phase is an introduction to the concepts of acids, bases and salts. Example, Na. H 2 SO 4 + Zn → ZnSO 4 + H 2 Acids + Metal Carbonate/Metal hydrogen Carbonate = Salt + CO 2 e.g NaHCO 3 + HCl → NaCl + H 2 O + CO 2 Acids + Bases → Salt + water (b) 8 mL All bases act as electrolyte in aqueous states i.e. Chemical name :Calcium Oxychloride An acid is a substance that renders ionizable hydronium ion (H3O+) in its aqueous solution. 3. (i) Sodium chloride (ii) Ammonium nitrate That is, a solution having low concentration of hydrogen ions has a higher pH value. How one can be relieved from the sting of beetle? Sodium hydrogen carbonate is produced on a large scale by reacting a cold and concentrated solution of sodium chloride (called brine) with ammonia and carbon dioxide. if(k.className == "adPushupAds" && k.getAttribute("data-push") != "1") { When sodium carbonate is dissolved in water, it gets hydrolysed to some extent and forms sodium hydroxide and carbonic acid. (d) 10, Q2. 3) Basic solution. (d) Antiseptic. → Litmus solution is a … 7. Fresh milk has a pH of 6. Ans. How will you test the evolution of this gas?  (2015) The substance is Copper sulphate crystals (CuSO4.5H2O) which are blue in colour. Acid Base and Salt. CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. (a) 4 mL Tomato contains oxalic acid. (a) Water soluble bases are called alkalis, e.g., NaOH, KOH. Reaction with Metals: They react with base to form oxy salt and hydrogen gas is released. It is used for removing permanent hardness of water. Why should Plaster of Paris be stored in a dry place?  (2017 D) It is the Logarithm of Reciprocal of Hydrogen ion Concentration. (ii) Which solution has more H+ ion concentration? Dry HCl gas does not change the colour of dry blue litmus paper because it has no hydrogen ions [H+ (aq)] in it. What are these water molecules called as? There actually, A: Acids not show acidic behaviour in the absence of water because in absence of water they do not get ionized to produce hydrogen ions, Chapter 1 Chemical Reactions and Equations Class 10, Chapter 2 Acids, Bases and Salts Class 10 Science Chapter, Chapter 3 Metals and non metals Class 10 Science Chapter, Chapter 4 Carbon and its Compounds Class 10 Science Chapter, Chapter 5 Periodic Classification of Elements Class 10 Science Chapter, Chapter 6 Life Processes Class 10 Science Chapter, Chapter 7 Control and Coordination Class 10 Science Chapter, Chapter 8 Reproduction Class 10 Science Chapter, Chapter 9 Heredity and Evolution Class 10 Science Chapter, Chapter 10 Light - Reflection and Refraction Class 10 Science Chapter, Chapter 11 The Human Eye and the Colourful World Class 10 Science Chapter, Chapter 12 Electricity Class 10 Science Chapter, Chapter 13 Magnetic Effects of Electric Current Class 10 Science Chapter, Chapter 14 Sources of Energy Class 10 Science Chapter, Chapter 15 Our Environment Class 10 Science Chapter, Chapter 16 Sustainable Management of Natural Resources Class 10 Science, CBSE Class 10 Science Syllabus 2019-2020 Session, Tips to score 95% in class 10 Science paper, Learn English Grammar in Hindi ( step by step) - Learn English Online Videos, English Writing Skills - Class 10, 12 Letter Formats, Email etc, Entrance Exams for Arts students after Graduation, List of Entrance Exams conducted by IGNOU, There actually exists the equilibrium between dissociated ions and undissociated, Effect Of Acid On Vanilla Extract: same smell, Effect Of Base On Vanilla Extract:smell changes, Effect Of Acid On Onion Extract:same smell, Effect Of Base On Onion Extract: smell changes, Used in detergents as it has cleansing properties, Reaction with water : when used it has to mixed with water and following reaction occurs-. (c) LiCl We can dilute the concentrated acid but need to take certain precautions as   Na2CO3.10H2O  → Na2CO3+10H2O                                            Solution with pH=4,5,6 are weak acids. In Dairies: Ph Value Of Milk Is Adjusted About 6.6. We have olfactory indicators as well that bring about change in smell when any substance is added to it. 1. All acids act as electrolytes in aqueous states CBSE class 10 Science Chapter 2 Acids Bases and Salts notes in PDF are available for free download in myCBSEguide mobile app. a) Acid is sour in taste. (b) Solution A gives pink colour when a drop of phenolphthalein indicator is added to it. Lemon contains citric acid. Effect on methyl orange: original color (orange) Metals react with dil. Chemicals from common salt; NCERT Solutions for Class 10 Chapter 2 Science Acids bases and salts. A : (a)To prevent rancidity They are sour. Example : HCL+Zn→ZnCl2+H2, 3. pH of solution B = 5 In Case Of Bases On Dilution: Ph Decreases as basic strength decreases i.e. It is Formed When Weak Or Strong Acid And Base React With Each other. Q14. 29. (b) HCl is a stronger acid than acetic acid because strength of acid depends on the number of H+ ions produced. (e) 9 exists the equilibrium between dissociated ions and undissociated molecules of The Acids, bases, salts SAILS unit was developed by the team at the University of Piraeus Research Centre (UPRC), as part of the SAILS project. 2. Washing soda is used in the glass, soap and paper industries. Bring a burning candle near hydrogen gas-filled bubble. 26.How sting of yellow weeps can be neutralized? sulphuric acid to give metal sulphates and hydrogen gas. This is due to the fact that soap solution is basic in nature which changes the colour of turmeric in the curry stain to red-brown. 22. The Nature of Salts Can Be-, Acidic Salt (Ca(OH)2) is added to salt to remove its acidity. : PH =-LOG(H+) ? Question 4. 2Fe+6HCl-->2FeCL3+3H2. Use: Plaster of Paris is used in hospitals for setting fractured bones in the right position to ensure correct healing. Curd contains Lactic acid. Plaster of Paris should be stored in a moisture-proof container. is released. (b) Chemical formula of two such compounds whose one formula unit is associated with 10 and 2 water molecules respectively. Ph ranging from 7 to 14 are bases (ii) Our stomach and intestines work in a specific pH range. (d) KCl, Q3. Reactant: Gypsum It is produced by the action of chlorine on dry slaked lime Ca(OH). Ph is the Logarithm of Reciprocal of Hydrogen ion Concentration. Classification of bases: Answer: Washing soda is produced by Solvay process, by the reaction of ammonical brine with CO2 gas. How can it be prevented? Q15. Mark them as ‘A’ and ‘B’. Ans. Q10. → Acids are sour in taste and change the colour of blue litmus to red. 17.What is the value of ‘x’ for sling acids? Give an example.  (2012, 2014) When milk changes into curd, its pH value will decrease because curd contains lactic acid (pH < 6 of acids). Rubbing of baking soda on the sting area gives relief. Test tube ‘B’ NaHCO3 (s) + HCl (aq) → NaCl (aq) + CO2 (g) + H2O (l). So its aqueous solution is neutral. If Ph Falls Below 6.6 It Turns Sour. What change would be observed in lime water? Two solutions A and B have pH values of 5 and 8 respectively. There actually //
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