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Chemistry-

General

Easy

Question

Which of the following will have maximum pH?

$\frac{M}{10} H C l$
$\frac{M}{100} H C l$
$\frac{M}{10} N a O H$
$\frac{M}{100} N a O H$

The correct answer is: $fraction numerator M over denominator 10 end fraction blank N a O H$

$p H equals negative log invisible function application left square bracket H to the power of plus end exponent right square bracket$
pH=14 $minus$ pOH
Calculate pH of all the solution to find which will have maximum pH.
$therefore open square brackets H to the power of plus end exponent close square brackets equals 10 to the power of negative 1 end exponent$
$p H equals negative l o g blank left square bracket H to the power of plus end exponent right square bracket$
$equals negative log invisible function application open square brackets 10 to the power of negative 1 end exponent close square brackets$
$equals 1$
$therefore open square brackets H to the power of plus end exponent close square brackets equals 10 to the power of negative 2 end exponent$
$p H equals negative log invisible function application left square bracket H to the power of plus end exponent right square bracket$
$equals negative log invisible function application left square bracket 10 to the power of negative 2 end exponent right square bracket$
$equals 2$
(C ) $M divided by 10 blank N a O H$
$therefore open square brackets O H to the power of minus end exponent close square brackets equals 10 to the power of negative 1 end exponent$
$p H equals 14 minus p O H$
$equals 14 left square bracket negative log invisible function application 10 to the power of negative 1 end exponent right square bracket$
$equals 14 minus 1$
$equals 13$
(D ) $M divided by 100 blank N a O H$
$therefore open square brackets O H to the power of minus end exponent close square brackets equals 10 to the power of negative 2 end exponent$
$p H equals 14 minus p O H$
$equals 14 minus left square bracket log invisible function application 10 to the power of negative 2 end exponent right square bracket$
$equals 14 minus 2 equals 12$
$therefore M divided by 100 blank N a O H$ solution has highest pH.

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