Consider the salts NaCl, NaOH, and NaCN. Which of these will give an acidic solu

Question

Consider the salts NaCl, NaOH, and NaCN. Which of these will give an acidic solution when dissolved in pure water? NaCN None of these will give an acidic solution NaCl NaCl and NaCN NaOH The equilibrium constant (or dissociation constant) for the autoionization reaction of water is 1.0 times 10^-14. In pure water at 298 K, what is the molar concentration of hydroxide ions (i.e., [OH-D])? [OH^-] = 1.0 times 10^7 [OH^-] = 1.0 times 10^-3 [OH^-] = 1.0 times 10^14 [OH^-] = 1.0 times 10^-14 [OH^-] = 1.0 times 10^-7 What is the pH of a o94 M solution of the weak base pyridine (C_5H_5N K_b = 1.7 times 10^-9)?

Explanation / Answer

Q4.

which will be acidic in solution

NaCl --> NA+ +Cl-, this is neutral

NaOH --> Na+ + OH. this will be basic

NaCN --> NA+ + CN-; CN- + H2O <--> HCN + OH- this is basi

answer is "NONE"

Q5.

Kw = 10^-14

then

Kw = [H+][OH-]

10^-14 = x*x

x = Sqrt(10^-14) = 10^-7

choose

[OH-] = 10^-14 M

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