Select one: a. 2 Al2O3 2 Al + 3 O2 b. K2CrO4 + Pb(NO3)2 2 KNO3 + PbCrO4 c. 4 Fe3

Question

Select one:

a. 2 Al2O3 2 Al + 3 O2

b. K2CrO4 + Pb(NO3)2 2 KNO3 + PbCrO4

c. 4 Fe3O4 + O2 6 Fe2O3

d. C7H16  + 5O2 7CO2 + 8H2O

b. A base can be described as a chemical species that when dissolved in water produces

Select one:

a. hydronium ions.

b. a solution with a low pH.

c. a buffer solution.

d. hydroxide ions

c. The ability of a buffer to resist change in pH is called its buffer capacity. Based on your practical experience, how would a 1/10 dilution affect the buffer capacity.

Select one:

a. There would be no change.

b. Buffer capacity would decrease by a factor of 10.

c. Buffer capacity would decrease slightly.

Explanation / Answer

First question is not clear what you have asked.

b. A base can be described as a chemical species which produces hydroxide ion when dissolved in water. Option - d

c.Buffer capacity would decrease on dilution because the concentration has been reduced, but the change will be slight and it will be not as high as decrease by a factor of 10.

Hence the correct option is (c)

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