Which of the following salts is obtained from performing a reaction of a weak ac

Question

Which of the following salts is obtained from performing a reaction of a weak acid and a strong base? a. NaNO_3 b. CaCl_2 c. NH_4Cl d. NaC_2H_3O_2 e. none of the above A strong acid and a weak base, respectively, are a. HBr & HI b. HF & NaOH c. HCOOH & NH_3 d. HIO & NH_3 e. none of the above Drying agents called desiccants can be based on the cobalt complexes shown as Co(H_2O)^2+_6 (aq) + 4Cl (aq) rightarrow CoCl^2-_4 (aq) + 6H_2O (l) If this desiccant is moist, then the color will be a. Clear b. blue c. pink d. red e. yellow

Explanation / Answer

3. Answer :- option D (NaC2H3O2)

   option A is wrong since NaNO3 forms by using HNO3 which is a strong acid.

   option B is wrong since NaNO3 forms by using HCl which is a strong acid.

   option C is wrong since NaNO3 forms by using NH3 which is a weak base.

4. Answer is :- option E (none of the above)

   A strong acid is one that completely dissociates in a solution and

   A weak base is a proton acceptor that when put in water will only partially dissociate.

   option A is wrong since HBr and HI completely dissociates in water so both are strong acids.

option B is wrong since NaOH is strong base as it is completely dissociate in water.

option C is wrong since HCOOH is partially dissociate in water so weak acid.

   option D is wrong since HIO is weak acid since it forms a conjugate pair in water.

5.Answer :- option C (pink)

    Anhydrous cobalt chloride is blue. When it bonds with two water molecules, it turns purple. Further hydration results in the pink hexaaquacobalt(II) chloride complex [Co(H2O)6]Cl2.

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