Buffer A ( 7.5mL of 10^-2M acetic acid + 7.5mL of 10^-2M sodium acetate) Undilut

Question

Buffer A ( 7.5mL of 10^-2M acetic acid + 7.5mL of 10^-2M sodium acetate)
Undiluted pH : 5.90, Initial diluted pH: 6.02, Final pH: 7.09, Volume of NaOH added: 14.omL , Change ofpH/Change of Volume : 0.076

Buffer B (3.0mL of 10^-2M acetic acid + 12.0mL of 10^-2M sodium acetate)
Undiluted pH : 6.60, Initial diluted pH:7.04, Final pH:8.06, Volume of NaOH added: 9.5mL , Change ofpH/Change of Volume : 0.121

Lemonade :
Undiluted pH : 2.29, Initial diluted pH:2.37, Final pH:2.69, Volume of NaOH added: 50.0 mL , Change ofpH/Change of Volume : 6.4E-3

Using above information, Is there any difference between Buffer A and B??

Would we classify lemonade as a buffer from this data???(explain plz)

Explanation / Answer

Yes, there is a difference between Buffer A and buffer B. The biggest difference is the change of pH/change of Volume ration. Buffer A has a lower ratio which means it is a better buffer. Aside from this the ratio of acetic acid and sodium acetate is much different. Instead of a 1:1 ratio, there is 1:4.

Yes, we would classify lemonade as a buffer because it resists change in pH very well. This follows the definition of a buffer.

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