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From The Chemistry Book
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The pH scale represents the acidity of a solution. [1] The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.
Calculating pH
 Things to Remember |
| The number of decimal places for a log must be equal to the number of significant figures in the original number.
For example, [H+] = 1.0 x 10-6 has 2 significant figures which means the answer must have 2 decimal places (6.00). |
pH is defined as pH = -log[H+]
Practice Problems
| Practice Problems |
| Calculate the pH for a solution in which [H+] = 1.0 x 10-9. |
| Solution |
| Step 1: Enter the number into the calculator Step 2: Push the log key to give -9.00 |
| pH = 9.00 |
From Self-Check Exercise 16.3 [2]
- A solution in which [H+] = 1.0 x 10-3
- A solution in which [OH-] = 1.0 x 10-5
From Questions and Problems (p. 532-535) [3] No. 29 As the hydrogen ion concentration of a solution increases, does the pH of the solution increase or decrease? Explain.
No. 30. Calculate the pH corresponding to each of the hydrogen ion concentrations given below. Tell whether each solution is acidic, basic, or neutral. a. [H+] = 0.00100 M b. [H+] = 9.18 x 10-11 M
References
- ↑ Zumdahl, S.S., Zumdahl, S. L., DeCoste, D. J. (2006). World of Chemistry. Houghton Mifflin Company.
- ↑ Zumdahl, S.S., Zumdahl, S. L., DeCoste, D. J. (2006). World of Chemistry. Houghton Mifflin Company.
- ↑ Zumdahl, S.S., Zumdahl, S. L., DeCoste, D. J. (2006). World of Chemistry. Houghton Mifflin Company.