Given the following choices, determine which description best describes the solu

Question

Given the following choices, determine which description best describes the solution resulting from the mixing of 10 ml of each of the solutions below. strongly acid strongly basic acid buffer basic buffer pH of NaHCO_3 neutral no hydrolysis basic due to hydrolysis acid due to hydrolysis. ____________ 0.1 M HAc + 0.05 M NaOH __________ 0.1 M HAc + 0.1 M NaOH ___________ 0.05 M HAc + 0.1 M NaOH ____________ 0.1 M H_2CO_3 + 0.05 M NaOH __________ 0.1 M H_2CO_3 + 0.1 M NaOH ___________ 0.1 M H_2CO_3 + 0.15 M NaOH __________0.1 M H_2CO_3 + 0.2 M NaOH __________ 0.1 M H_2CO_3 + 0.25 M NaOH

Explanation / Answer

a. Is a mixture of acetic acid and NaOH. Where excess acetic acid is used. So the resultant solution contains acetic acid and sodium acetate, formed after the neutralization reaction of acetic acid and sodium hydroxide. Thus, it acts as basic buffer, that is option D. It is well known that a mixture of weak base with its salt acts as a basic buffer

b. In this case equimolar amounts of acetic acid and sodium hydrixide are used. The product formed is sodium acetate, which hydrolyzes to give a basic solution. Option is G

c. Inthis case excess sodium hydroxide is used. After neutralization reaction the formed sodium acetate can also hydrolyze to give a basic solution and presence of excess base also result in the hihh pH or highly basic solution. Option is B

d. One carbonic acid can react with two sodium hydroxide molecules. Thus, in the present case, concentration of sodium hydroxide is half of that of carbonic acid. Thus in solution sodium bicarbonate and residual carbonic acid also will be there. Thus it acts as an acidic buffer. A salt of weak acid with the corresponding weak acid can act as an acidic buffer. Option C

e. In this case, equimolar amount of carbonic acid and NaOH are used. Which results in the formation of sodium bicarbonate. Now the solution contains only sodium bicarbonate and its pH will be equal to that of sodium bicarbonate. Option E

f. 0.1 M carbonic acid and 0.15 M NaOH react to give a mixture of sodium carbonate and sodium bicarbonate. Which is mixture of a weak base, sodium carbonate, and its salt sodium bicarbonate. Thus it acts as a basic buffer. Option D

g. 0.1 M carbonic acid reacts with 0.2 M NaOH to give sodium carbonate. However, it can hydrolyze to give a basic solution. Option G

h. Excess NaOH is there and thus solution is strongly basic. Option B

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