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### question 6B.7

Posted: Sun Jan 19, 2020 6:30 pm
The pH of several solutions was measured in research laboratories of a food company; convert each of the following pH values into the molar concentration of H3O+ ions: (a) 3.3 (the pH of sour orange juice); (b) 6.7 (the pH of the saliva sample); (c) 4.4 (the pH of beer); (d) 5.3 (the pH of a coffee sample)

### Re: question 6B.7

Posted: Sun Jan 19, 2020 6:35 pm
i believe it is 10^(of the ph)

### Re: question 6B.7

Posted: Sun Jan 19, 2020 6:58 pm
Since pH=-log[H3O+}, the concentration of H3O+ would be 10 to the -pH.

### Re: question 6B.7

Posted: Sun Jan 19, 2020 7:00 pm
To convert from pH to [H3O+] you just need to use the equation [H3O+]= 10^(-pH).

### Re: question 6B.7

Posted: Sun Jan 19, 2020 9:13 pm
Make sure to remember that significant figures for logs involves the numbers after the decimal. So if there were two significant figures given in the problem, setting up the equation for pH would involve using two significant figures after the decimal point.