Question

Which of the following do you think is a correct statement?

• A. Ammonium hydroxide / ammonium chloride is an acidic buffer
• B. Boric acid/borax is an acidic buffer
• C. Henderson hasselbalch equation is given by $pH=p{K}_b+log\frac{\left[salt\right]}{\left[acid\right]}$
  
• D. $pH+pOH=4$ at ${25}^{o}C$

Answer 1

The correct option is B Boric acid/borax is an acidic buffer

Mixture of weak acid and salt of the weak acid and strong base will make a acidic buffer solution.

• Boric acid is a weak acid. Borax is a salt of boric acid(weak acid) and $NaOH$ (strong base). So the resultant solution is called a acidic buffer solution.

Mixture of weak base and salt of the strong acid will make a basic buffer solution.
Ammonium hydroxide/ammonium chloride is a basic buffer.
Henderson hasselbalch equation for acidic buffer is given by $pH=p{K}_a+log\frac{\left[salt\right]}{\left[acid\right]}$ and at ${25}^{o}C$ $pH+pOH=14$. So the only correct ststement is (b).