Calculate the pH for
(i) `0.001` M HCl
(ii) `0.0001 ` M `H_(2) SO_(4)`
(iii) ` 10^(-2) Ca(OH)_(2)` ,
(iv) `10^(2) M HCl `

Explanation

To calculate the pH for the given solutions, we will use the formula:

\[ \text{pH} = -\log[\text{H}^+] \]

where \([\text{H}^+]\) is the concentration of hydrogen ions in the solution.

### (i) For 0.001 M HCl:

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