A sample of freshly pressed apple juice has a pH of 3.76.Calculate the [H+].

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Explanation: 

Because the pH between  3 and  4 , we know immediately that [H+] will be between 10-3 and 10-4 .From equation defining pH , we have

pH = - log [H+] = 3.76

thus, log [H+] = -3.76

To find [H+] we need  to determine the antilog of -3.76 .

[H+] = antilog (-3.76 ) = 10 -3.76  = 1.7 x 10-4 M

Answer: 

1.7 x 10-4 M