You're making this much harder than it is. Don't be intimidated by chemistry. The difference is 7.4-6.4 = 1.0, right?
To convert pH to H3O^+, use
pH = -log(H3O^+)
7.4 = -log(H3O^+) and
6.4 = -log(H3O^+).
Solve each for H3O^+ and subtract these two numbers to find how much more in one than the other.
The pH of blood is 7.4 and that of saliva is 6.4. what is the difference in pH between these two solutions? How much more Hydronium ion (H3O+) is in the saliva than in the blood.
I need a detailed answer with the formulas if you can. I have a hard time with chemestry
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