What will be the percentage error in measuring hydrogen ion concentration in a 10^-6 M - solution on neglecting the contribution of water at 25°C?

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Question

What will be the percentage error in measuring hydrogen ion concentration in a 10^-6 M - $HCl$ solution on neglecting the contribution of water at 25°C?

Prashant Kotian · Accepted Answer

Correct answer: D. Solving (10^-6 + x)x = 10^-14 gives x = 0.0099 * 10^-6 M. Actual [H+] = 1.0099 * 10^-6 M. Measured [H+] = 10^-6 M. % error = (1.0099 - 1.0000)/1.0099 * 100 = 0.98%.

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