Question

Mark the appropriate choice to fill up the blanks in the given paragraph.

A solution which maintains a constant pH when small amounts of acid or base are added is known as a ___$\left(i\right)$___. A mixture of acetic acid and sodium acetate acts as ___$\left(ii\right)$___ with a $pH$ around ____$\left(iii\right)$___ and a mixture of ammonium chloride and ammonium hydroxide acts as ___$\left(iv\right)$____ with a $pH$ around ___$\left(v\right)$____.

• A. $\left(i\right)$ - buffer capacity; $\left(ii\right)$ - basic buffer; $\left(iii\right)$ - $9.25$; $\left(iv\right)$ - acidic buffer; $\left(v\right)$ - $4.75$
• B. $\left(i\right)$ - buffer solution; $\left(ii\right)$ - acidic buffer; $\left(iii\right)$ - $9.25$; $\left(iv\right)$ - basic buffer; $\left(v\right)$ - $4.75$
• C. $\left(i\right)$ - buffer solution; $\left(ii\right)$ - basic buffer; $\left(iii\right)$ - $4.75$; $\left(iv\right)$ - acidic buffer; (v) - $9.25$
• D. $\left(i\right)$ - buffer solution; $\left(ii\right)$ - acidic buffer; $\left(iii\right)$ - $4.75$; $\left(iv\right)$ - basic buffer; $\left(v\right)$ - $9.25$

Answer 1

The correct option is D $\left(i\right)$ - buffer solution; $\left(ii\right)$ - acidic buffer; $\left(iii\right)$ - $4.75$; $\left(iv\right)$ - basic buffer; $\left(v\right)$ - $9.25$

A solution which maintains a constant pH when small amounts of acid or base are added is known as a buffer solution.

A mixture of acetic acid and sodium acetate acts as acetic buffer with a pH around 4.75.

A mixture of ammonium chloride and ammonium hydroxide acts as a basic buffer with a pH around 9.25.

Hence, option D is correct.