Which of the following aqueous salt solutions would you expect to be neutral, e. pH=7. A) NaCN (ag) B) NH4Br (aq) C) NaCN (aq) D) KBr (aq) E) Ca (NO2) 2 (aq)

Question

Chemistry

Tamara Gamble

12 May, 16:15

Which of the following aqueous salt solutions would you expect to be neutral, e. pH=7. A) NaCN (ag) B) NH4Br (aq) C) NaCN (aq) D) KBr (aq) E) Ca (NO2) 2 (aq)

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Answers (1)

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Roselyn Murray · Answer 1

D) KBr (aq)

Explanation:

The salt has pH = 7 or is neutral when it is made up of a strong acid and a strong base.

A) NaCN is made up of NaOH and HCN.

NaOH is a strong base but HCN is a weak acid. It will have pH greater than 7.

B) NH₄Br is made up of NH₄OH and HBr.

NH₄OH is a weak base and HBr is a strong acid. It will have pH less than 7.

C) NaCN is made up of NaOH and HCN.

NaOH is a strong base but HCN is a weak acid. It will have pH greater than 7.

D) KBr is made up of KOH and HBr.

KOH is a strong base and also HBr is a strong acid. It will have pH equal to 7.

E) Ca (NO₂) ₂ is made up of Ca (OH) ₂ and HNO₂.

Ca (OH) ₂ is a strong base but HNO₂ is a weak acid. It will have pH greater than 7.