Question

The pH of 0.1M $NaCl\;$ solution is:
A. 1
B. 13
C. 7
D. Zero

Answer 1

Hint: - For solving these types of questions we must remember the property of the pH scale and the what type of properties the pH scale shows when it reacts with acid and base solution.

Complete answer:
pH scale is a scale which is used to specify how acidic or basic a solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH. At room temperature, pure water is neither acidic nor basic and it has a pH of 7
$NaOH\; + \;HCl \to NaCl\; + \;{H_2}O$

In the above mentioned equation, sodium chloride is a salt that is formed due to the reaction of $NaOH\;$ which is a strong base and $HCl$ which is a strong acid.

Strong acids react with strong bases and they generally give neutral salts, and $NaCl\;$one of them.

Since it’s neutral in nature it doesn’t really affect the [H+] and [OH−] ions in water and its concentration doesn’t alter the pH of the solution. So, the pH remains 7.

Hence our answer is pH of 0.1M $NaCl\;$ solution is 7 and option C is the correct answer.

Note: The property of acid and base is very important for solving these types of questions. Also, we must know the products that are formed when strong acid and strong base react with each other and also the pH scale properties.