8. -0.42
ps. with solutions please
calculate the molar h3o+ ion concentration of a solution that has a ph of 
1. 4.31
2. 4.48
3. 0.59
4. 13.89
5. 7.62
6. 5.32
7. -0.76  ?
1.) [h3o+] = 10^-4.31 = 4.9 x 10^-5 m

2,3,4,5,6 and 7 are done the same way.

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