CBSE Class 10 Science Lab Manual – Properties of Acids and Bases EXPERIMENT 2(a) Aim To study the properties of acids (dil. The metals combine with remaining part of acids to form a salt. Question 9: (a) the surface of zinc becomes brighter He would observe that no gas is evolved in the setup: Magnesium metal and hydrochloric acid solution The ribbon and lab materials, the solution. > Hydrochloric acid react with sodium carbonate to release CO2 gas. The metals which react with acid and alkalies to produce hydrogen gas are For e.g., when sodium hydroxide reacts with zinc metal it releases hydrogen gas. (d) displacement reaction. Answer: Summarize your findings concerning the combination of non-reacting metals and metal ions in Tables 2a and 2b. (d) Sodium bicarbonate. (c) Lime is calcium oxide and water reacts with it to form lime water. NaOH) by their reaction with Litmus solution (blue/red) Zinc metal Solid sodium carbonate Materials Required Test tubes, test tube stand, test tube holder, cork, droppers, boiling tube, match-box, burner, […] What type of reaction is seen when zinc is added to HCl solution? Theory 3. Question 8: The gas turns lime water milky. (c) Carbonates release CO2 gas when reacted with acids. > Acids when dissolved in water release large amount of heat. (c) Na2CO3 (d) Na2SO4. Zinc metal reacts with both acid and base to release H2 gas. NaOH reacts with zinc metal to release H2 gas. What is X? The water reacting with the electric currents going through the equipment. What will be the colour of a blue litmus paper on bringing it in contact with a drop of dil. A dull coin which is coated with deposits of carbonates and hydrogen carbonates can be cleaned with: (c) bums with a pop sound Hydrogen gas is lighter than air and it will easily escape in the air. Question 2: (d) oxygen. (d) all of these. (d) has a pungent odour. The pH scale is used to measure how acidic or basic a solution is. Activity 4 in this program has an abbreviated set of metals with HCl(aq). The solution remains colourless. When sodium carbonate reacts with hydrochloric acid, carbon dioxide gas is released. In this activity students react a limited range of metals with three different acids and isolate the compounds formed. On making the contents react in both the test tubes, hydrogen gas was formed in both the cases. > It turns blue litmus solution red. 1. (b) Shiny surface of zinc gets coated with zinc chloride which is dull and black. 30. Na2ZnO2(aq) + H2(g) Hydrogen gas always bums with a pop sound. Lesson 2: Adding Acids to Metals Lesson 3: Adding Acids to Metal Carbonates Lesson 4: Reacting metals and non-metals with Oxygen Lesson 5: Combustion of Fuels What will be the colour of a blue litmus paper on bringing it in contact with a drop of dil. Answer: HCl) and bases (dil. Answer: (a) supports combustion (C) H2 31. The reaction between dilute hydrochloric acid and solid sodium carbonate shows the following: Acids and Bases: Their Reactions, Conductivity, Base Indicators. Y is an acid. 25. (c) C (d) D. 31. (a) I (b) II Reactions of acids with metals. 27. Simple Chemical Reactions Simple Chemical Reactions Solutions Solids, Liquids and Gases Acids and Alkalis Lesson 2: Adding Acids to Metals Lesson 1: Chemical or Physical Reaction? Hydrogen gas is released when aluminium metal reacts with sodium hydroxide. Table of Contents. (a) Cu (b) Zn (c) Fe (d) Pb. (d) a colourless and odourless gas evolves with bubbles. (b) HCl When acid reacts with metallic oxide then it forms corresponding salt and water. 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HCl acid. (c) Al and K Question 4: Always carry out the test for hydrogen with a very small volume of gas. (b) hydrogen gas is released with dil HCl > Hydrochloric acid reacts with metals to release hydrogen gas. (c) it bums rapidly (d) Hydrogen gas is released which is colourless and odourless. (b) Hydrogen gas is combustible. (c) it is acidic in nature 17. (d) it is neutral in nature. Hydrogen gas does not show any change with the litmus paper because: The correct observations are: Category: Chemistry. Answer: (c) III (d) IV. We are working to restore a broken URL for this simulation. The experiment is done first on a smaller scale using test tubes (lesson 1 below), with no attempt to recover the salts formed. > If an acid releases one H+ ion, it is called monobasic acid, e.g., HCl, HNO3, CH3COOH. The chemical reaction in which zinc metal reacts with dil. Which gas is produced when zinc metal reacts with hydrochloric acid? The blue litmus paper turns red when it comes in contact with dil. HCl Hence to avoid burns acid must be added drop wise into water with constant stirring. > Acids can be categorized depending on the number of H+ ions released by it. Handle hydrochloric acid and sodium hydroxide solutions very carefully. Acids react with metal carbonates such as calcium carbonate to produce a salt, water and carbon dioxide. Acids react with active metals to yield hydrogen gas. In this section of the lesson I build on the introduction to Acids and Bases from the lab by having students take notes. > It turns red litmus solution blue. (b) Hydrogen gas is lighter than air but it is explosive in nature, hence it is not collected by downward displacement of air. NaOH? Neutralisation Reaction: Acids and bases react with each other to produce salt and water. This can be seen in the equation: Metal carbonate + Acid Salt + Water + Carbon dioxide. (a) it neutralizes HCl in our stomach When Acid Gets Mixed Up With A Base:- When the acids get mixed up with a base, the reaction is … (a) zinc granules turned green When zinc metal reacts with dilute hydrochloric acid, the gas evolved 33. (d) Acids react with it. (c) bubbles of a gas (c) odour of chlorine is observed 21. The burning splinter will extinguish, because carbon dioxide gas does not support combustion. (c) Sodium hydroxide CBSE Maths notes, CBSE physics notes, CBSE chemistry notes, Science Lab Manual Class 10 Pdf Download Properties of Acids and Bases. The general word equation for the reaction between an acid and a metal is: acid + metal → salt + hydrogen gas. Question 7: Which gas is liberated when sodium carbonate reacts with hydrochloric acid? For example, zinc metal reacts with hydrochloric acid, producing zinc chloride and hydrogen gas. In this virtual simulation, you will learn the fundamentals of acids and bases and go through some of the ways they can be characterized and used in the lab. (b) Zn and Na (c) neutralisation reaction (d) both (a) and (b) are incorrect. The reaction when magnesium is … 12. [CBSE Delhi 2008] Question 6: > If an acid dissociates (splits) completely into ions it is called strong acid, e.g., sulphuric acid (H2SO4). C3.3 Types of chemical reactions. (a) carbonate What is ‘ Y’? (c) colourless due to the formation of CaCO3 Question 10: (a) NaCl Answer: General equation for the reaction of an acid with a metal. On passing excess CO2 through lime water it becomes colourless. Get Free Access See Review When excess CO2 gas is passed through lime water, it forms calcium hydrogen carbonate which is soluble in water. Materials Required (c) both (a) and (b) Zinc metal displaces hydrogen when reacted with acids. 5. The blue litmus paper remains blue when it comes in contact with a drop of dil. Answer: 22. 14. (b) SO2 (c) Carbon dioxide gas is released. The correct observation and inferences have been recorded by student 10. HCl. 13. 30. (b) a loud sound is produced Acids and bases are found all around us: In the food we eat, the beverages we drink, many of the everyday household products at home and even inside us! In this virtual simulation, you will learn the fundamentals of acids and bases and go through some of the ways they can be characterized and used in the lab. (d) O2. (c) Granules has increased surface area for fast reaction. The type of salt that forms will depend on the specific metal and acid which are used in the reaction. Question 11: Zinc metal reacts with the acid. LAB -Chap 15: Properties of Acids & Bases ANSWERS IN THIS COLOR Purpose: Reactions in aqueous solution in which protons are transferred between species are called acid/base reactions.Several properties of acid/base chemistry will be qualitatively studied in this experiment. The dependent (outcome) variable will. Answer: A student added dilute HCl to a test tube containing zinc granules and made following observations. > Test for CO2 gas: When CO2 gas is allowed to pass through freshly prepared lime water, then the lime water turns milky or when a burning splinter is brought near the mouth of the test tube releasing CO2 gas then the burning splinter extinguishes. HCl is an example of Dilute HCl reacts with sodium carbonate to release a colourless gas. 15. (a) milky due to the formation of CaCO3 (b) the reaction mixture turns milky Theory Hydrochloric acid Acids react with most metals and, when they do, a salt is produced. Answer: > When it is dissolved in water; releases H+(aq) ions, these H+ ions cannot exist alone. Metal carbonates such as calcium carbonate (chalk) react with acids to produce the gas carbon dioxide. (a) Litmus solution (Blue/Red) (b) Zinc metal (c) Solid sodium carbonate. 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