Q.1 0.1 mole of which of the reagents listed below[(1)to(6)]could be added to 1 litre of water to make 0.1M solutions of each of the following ions seprately?

(a)NH4^+ (b)CH3COO^- (c)Cl^-
(1) NH3 (2)NH4Cl (3) CH3COOH
(4)CH3COONa (5)HCl (6)NaCl

Q.2 Explain why CH3COOH2^+ is an acid?

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Q.1 To determine which reagents can be added to water to make 0.1M solutions of the given ions, we need to consider the dissociation of the reagents in water.

(a) NH4^+:
NH4Cl (Option 2) can be added to water to make a 0.1M solution of NH4^+ ion. When NH4Cl is dissolved in water, it dissociates into NH4^+ and Cl^- ions. Since NH4^+ is the desired ion, NH4Cl is the appropriate reagent.

(b) CH3COO^-:
CH3COONa (Option 4) can be added to water to make a 0.1M solution of CH3COO^- ion. When CH3COONa is dissolved in water, it dissociates into CH3COO^- and Na^+ ions. Since CH3COO^- is the desired ion, CH3COONa is the appropriate reagent.

(c) Cl^-:
HCl (Option 5) can be added to water to make a 0.1M solution of Cl^- ion. When HCl is dissolved in water, it dissociates into H^+ and Cl^- ions. Since Cl^- is the desired ion, HCl is the appropriate reagent.

To summarize:
(a) For NH4^+ ion, use NH4Cl (Option 2).
(b) For CH3COO^- ion, use CH3COONa (Option 4).
(c) For Cl^- ion, use HCl (Option 5).

Q.2 CH3COOH2^+ is an acid because it donates a proton (H^+) to a water molecule in an aqueous solution. The transfer of the proton makes CH3COOH2^+ an acid and generates the CH3COO^- ion. In other words, CH3COOH2^+ acts as an acid by releasing H^+ ions, which can react with a base or accept electrons in a chemical reaction. Acids are characterized by their ability to increase the concentration of H^+ ions in a solution.