Question

Between dilute and concentrated samples of HNO3 which sample of HNO3 will have a higher H+

ion concentration?

(a) dil. HNO3

(b) Conc.HNO3

(c) Both have same H+ ion concentration

(d) No H+ ion is present in HNO3​

Answer 1

Answer:

b) conc. HNO3

Explanation:

Concentrated HNO3 has more number of H  

+

 ions compared to dilute  HNO3. Thus, conc.  HNO3is more acidic and it will have a lower pH than dilute  HNO3.

Dilute solution of  HNO3 will have higher pH than concentrated solution.

Answer 2

Between dilute and concentrated samples of $\[HN{O_3}\]$ , the sample of $\[HN{O_3}\]$ that will have a higher $\[{H^ + }\]$  ion concentration is conc. $\[HN{O_3}\]$. Thus, teh correct option is (b).

Explanation:

• An acid having more $\[{H^ + }\]$  ion concentration will be more acidic as compared to the acid having less $\[{H^ + }\]$  ion concentration.
• The pH of the acid that has more $\[{H^ + }\]$  ion concentration will be less than the acid having less $\[{H^ + }\]$  ion concentration.
• In dilute acids, the concentration of the acid is less while the concentration of water is more.
• As the concentration of acid is less in dilute solutions, therefore, the concentration of $\[{H^ + }\]$  ion will also be less.
• On the other hand, in concentrated acids, the concentration of acid is more while the concentration of water is more. Thus, the concentration of $\[{H^ + }\]$  ion will also be more.
• Therefore, the sample of concentrated $\[HN{O_3}\]$ will have a higher $\[{H^ + }\]$  ion concentration.