A 1.00 liter solution contains 0.60 M hydrocyanic acid and 0.45 M sodium cyanide

Question

A 1.00 liter solution contains 0.60 M hydrocyanic acid and 0.45 M sodium cyanide.

If 40.0 mL of water are added to this system, indicate whether the following statements are true or false.

(Note the the volume MUST CHANGE upon the addition of water.)

_______TrueFalseA. The concentration of HCN will decrease.

_______TrueFalseB. The concentration of CN- will remain the same.

_______TrueFalseC. The equilibrium concentration of H3O+ will decrease.

_______TrueFalseD. The pH will decrease.

_______TrueFalseE. The ratio of [HCN] / [CN-] will increase.

Explanation / Answer

A = true . because upon adding water soluyion becomes dilute so concentration will decrease.

B = false . up un dilution concentration will change

C = true . if concentration of HCN will decrease meand H+   also will decrease.

D = false . because ratio of [CN-]/[HCN] will remain same so pH will be remain

E = false . ratio of [HCN]/[CN-] will remains same

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