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Chapter 2– Acids Bases and Salt Solutions

Question - 11 : - You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8.

Answer - 11 : -

Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?
Answer
In order to find the hydrogen ion concentration, we can use the rule that states, “The pH of any solution is inversely proportional to the hydrogen ion concentration”. Therefore, it means that the solution that has a lower pH number will have a higher hydrogen ion concentration. Hence, solution A will have a higher hydrogen ion concentration. In addition, solution B will be basic and A will be acidic.

Question - 12 : - What effect does the concentration of H+(aq) ions have on the nature of the solution?

Answer - 12 : - Hydrogen ion concentration decides the nature of the solution. If Hydrogen ion concentration increase then solution turn acidic and similarly if Hydrogen ion concentration decreases then solution turn basic.

Question - 13 : - Do basic solutions also have H+(aq) ions? If yes, then why are these basic?

Answer - 13 : - Basic solutions has H+ ions, but hydroxide ions present in basic solution are more in basic solution. Hence Hydroxide ions turn solution to basic.

Question - 14 : - Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Answer - 14 : - If the soil is acidic in nature (PH below 7) then such field should be treated with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate).

Question - 15 : - What is the common name of the compound CaOCl2?

Answer - 15 : - Common name of CaOCl2 is bleaching powder.

Question - 16 : - Name the substance which on treatment with chlorine yields bleaching powder

Answer - 16 : - The substance which on treatment with chlorine yields bleaching powder is Calcium hydroxide.

Question - 17 : - Name the sodium compound which is used for softening hard water.

Answer - 17 : - Sodium carbonate is the compound which is used for softening hard water.

Question - 18 : - What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.

Answer - 18 : - Heating sodium hydrocarbonate yields sodium carbonate and carbon dioxide gas is liberated in the process.

Question - 19 : - Write an equation to show the reaction between Plaster of Paris and water.

Answer - 19 : - The chemical equation for the reaction of Plaster of Paris and water is

CaSO4.1/2H2O + 3/2H2O → CaSO4.2H2O     

Question - 20 : - A solution turns red litmus blue, its pH is likely to be
a) 1 (b) 4 (c) 5 (d) 10

Answer - 20 : - Answer is 10 because litmus paper turns blue when reacts with basic solution (PH more than 7). Hence 10 is the answer.

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