CHEM102 Lecture Notes - Lecture 10: Without Loss Of Generality, Sodium Hydroxide
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A word about the significant figures in logarithms. For example: log 5. 43 x 1010 = 10. 735. The pre-decimal part accounts for the exponential and so does not count log 5. 43 x 1010 = 10. 735. What is the ph of a solution with hydrogen concentration = 3. 2 x 10-4 m. ph = -log [h+] = -log (3. 2 x 10-4) = - (-3. 49) = 3. 49. What is the ph of a naoh solution with hydroxide ion concentration = 2. 9 x 10-4 m. Kw = [h3o+] [oh-] = 1. 0 x 10-14 at 25oc. Therefore, pkw = - log [h3o+] [oh-] = - log 1. 0 x 10-14. Log [h3o+] + log [oh-] = 14. Log [h3o+] - log [oh-] = 14. Since mole ratio is 1 : 1, [oh-] = 7. 52 x 10-4 m. Therefore, poh = - log (7. 52 x 10-4) = 3. 124 ph = 14. 00 3. 124 = 10. 88 therefore it is basic.