Question
Asked Nov 10, 2019
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Which combination of solutions is the best for making a buffer solution? 

*Please show the reactions that are taking place. That's mainly what I'm having trouble with. Please also explain what happens to the spectator ions. 

Pg 5.
12. Which combination of solutions is the best choice for making a buffer solution?
15
equal volumes of 1 M ammonia (NH) and 0.001 M ammonium chloride (NHCI)
equal volumes of 0.5 M hydrochloric acid (HCl) and 0.5 M sodium hydroxide (NaOH)
equal volumes of 0.5 M hydrochloric acid (HCl) and 0.5 M sodium chloride (NaCl)
equal volumes of 2M ammonia (NH) and 1 M hydrochloric acid (HCI)
equal volumes of 2 M ammonium chloride (NH,CI) and 1 M hydrochloric acid (HCI)
а.
b.
с.
d.
е.
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Pg 5. 12. Which combination of solutions is the best choice for making a buffer solution? 15 equal volumes of 1 M ammonia (NH) and 0.001 M ammonium chloride (NHCI) equal volumes of 0.5 M hydrochloric acid (HCl) and 0.5 M sodium hydroxide (NaOH) equal volumes of 0.5 M hydrochloric acid (HCl) and 0.5 M sodium chloride (NaCl) equal volumes of 2M ammonia (NH) and 1 M hydrochloric acid (HCI) equal volumes of 2 M ammonium chloride (NH,CI) and 1 M hydrochloric acid (HCI) а. b. с. d. е.

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Expert Answer

Step 1

A buffer solution contains a mixture of a weak base/acid and it’s conjugate acid/base. In a good buffer solution, the concentration of the weak base and the conjugate acid are equal. The correct answer is option d.

Step 2

On the mixing of equal volumes of 2 M NH3 and 1 M HCl, only half of the NH3 reacts with all the HCl to produce NH4Cl. The reaction of NH3 and HCl is as follows:

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NH3+ HCINH CI

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Step 3

On the addition of equal volumes of acid and base, the concentration of NH3 and HCl in the mixture are 1 M and 0.5 M, respectively. On the reaction of NH3 with HCl, half of the ammonia gets converted into ammonium chloride. After the reaction, the final solution contains 0.5 M NH3 and 0....

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NHHO NH,+H0

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