Which of the following would produce a buffer solution when dissolved in 250 mL

Question

Which of the following would produce a buffer solution when dissolved in 250 mL ot water? HCN and NaF HBr and KOH HNO_2 and KNO_2 HCl and NaCl None of the above mixtures will make a buffer solution Entropy of a reaction increases for all of the following except: A reaction in which a molecule is broken into two or more smaller molecules. A reaction in which there is an increase in the number of moles of a gas. A reaction in which a gas changes into a solid A process in which a solid changes to a liquid or gas or a liquid changes to gas. Entropy increases for all of the above reasons What is the molar solubility of AgCl if the K_sp is 1.8 times 10^-10? 1.3 times 10^5 M 9.0 times 10^-11 M 1.3 times 10^-5 M 3.2 times 10^-20 M None of the above A solution of a weak base is found to have a pH = 10.87. What is the concentration of hydroxide in this solution? 1.35 times 10^-11 M -1.04 M 7.41 times 10^-4 M 3.13 M None of the above A spontaneous reaction must ha

Explanation / Answer

Q6.

buffer solution --> weak acid + conjugate base...

so...

HNO2 is the weak acid and KNO2 the conjugate (NO2-)

Q7

a) it in creases, since more molecules are created

b) increase in mol of gases will be more chaotic, therefore increases

c) gas to solid will be ordering a system, so less chaos, more order, less entropy, choose this one

d) solid to gas or liquid to gas is chaos generation, so entropy increases

e) false

Q8

AgCl <-> Ag+ + Cl-

Ksp = [AG+][Cl-]

1.8*10^-10 = (S)(S)

S = Sqrt(1.8*10^-10

S = 0.0000134164 M = 1.3*10^-5 M choose A

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