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# CW06-pH - [H 3 O =[OH = pH =(c For 0.012 M Ca(OH 2[H 3 O...

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CHM 2046/Myers Worksheet 6 January 19 or 21, 2010 1. pH = - log 10 [H 3 O + ] Note: HCl is a strong electrolyte: HCl(g or aq) + H 2 O(l) H 3 O + (aq) + Cl - (aq) (a) For 0.035 M HCl, [H 3 O + ] = _________ pH = ___________ (b) For 0.036 M HCl, [H 3 O + ] = _________ pH = ___________ How do we do significant figures when calculating a pH? (c) For 0.002 M HCl, pH = ___________ 3. Work this backwards, using the observed pH to find [H 3 O + ]: (a) If pH = 3.5, then: [H 3 O + ] = ___________ (b) If pH = 4.27, then: [H 3 O + ] = ___________ 4. 2 H 2 O(l) H 3 O + (aq) + OH - (aq), Kw = [H 3 O + ][OH - ] = 1.0 x 10 -14 (at 25°C) Given either H 3 O + or OH - , you can calculate the other, and the pH. (a) For 0.02 M HCl, [HCl] = _______ [Cl - ] = __________ [H 3 O + ] = ____________[OH - ] = ____________ pH = ___________ (b) For 0.03 M NaOH,

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Unformatted text preview: [H 3 O + ] = ____________[OH-] = ____________ pH = ___________ (c) For 0.012 M Ca(OH) 2 , [H 3 O + ] = ____________[OH-] = ____________ pH = ___________ 5. For “pure” water, find values for all of these. 2 H 2 O(l) H 3 O + + OH-(aq), Kw = [H 3 O + ] [OH-] I C E [H 3 O + ] = ____________[OH-] = ____________ pH = ___________ 6. The “p” in pH is a mathematical operator. Find the “p” version of Kw = … 7. Complete the table. Practice the keystrokes on your own calculator. Solution [H 3 O + ] [OH-] pH pOH (a) 0.1 M HCl (Example) 0.1 M 1 x 10-13 1.0 13.0 (b) 0.0155 M HCl (c) 0.25 M NaOH (d) ________ M HCl 3.5 (e) ________ M NaOH 12.7...
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