Chemistry · Ionization of water, pH scale, common ion effect, hydrolysis of salts and pH of their solutions, the solubility of sparingly soluble salts, solubility products and buffer solutions
Assertion At , the pH of HClis 8 Reason pH of acidic solution is always below 7
Assertion At \( 25^{\circ} C \), the pH of \( 10^{-8} M \) HClis 8 Reason pH of acidic solution is always below 7 \( \operatorname{at} 25^{\circ} C \)
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but the Reason is correct
Step-by-step solution
At 25°C, 10^{-8} M HCl has a total [H+] of approximately 1.1×10^{-7} M (including water autoionization), giving a pH of about 6.96, not 8. Thus assertion is false. The reason is true: acidic solutions have pH < 7 at 25°C.
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