as a food preservative, citric acid is mixed with sodium citrate which is used as a buffer solution. calculate how much ph of foods containing citric acid 0.1M and sodium nitrate 0.3M (Ka citric acid 8x10 ^ -4)

Question

gebooors · Answer

Use HEnderson-Hasselbalch equation
pKa = - log (Ka)

andriani · Answer

please show me the details

zale101 · Answer

Henderson-Hasselbalch equation states $pH=pK_a+log[\frac{[A^-]}{[HA]}]$
Giving the balanced euqation $ HA\rightarrow\ H^+(aq)+A^-(aq)$

HA is the generic acid. 
H+ is the hydrogen ion that lost an e-
and A- is the conjugate base of the acid HA

[A-] is the concentration of the conjugated acid
[HA] is the concentration of the acid

To get the pKa use $pKa=-log(Ka)$

Good thing they gave you the Ka. All you have to do now is take the negative log of it and you will get the pKa.

Follow this balanced equation $ HA\rightarrow\ H^+(aq)+A^-(aq)$ and create the appropriate balanced equation of your question.
What is your acid or HA here?
What is your conjugate base or A- here?

andriani · Answer

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andriani · Answer

ummm... would u tell me the reason why we use this equipment??