pH_wksht_2 - -4 M HI solution. pH = -log (9.8 x 10-4 ) =...

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pH Worksheet #2 1) Find the pH of a 9.8 x 10 -4 M HI solution. 2) Find the pH of a 2.76 x 10 -4 M NaOH solution. (Hint: this is a basic solution concentration is of OH - ) 3) Find the pH of a solution made by diluting 35 mL of 4.5 M HNO 3 to a final volume of 2.25 L. 4) Find the pH of 4.75 L of an aqueous solution that contains 3.20 grams of HCl and 1.85 grams of nitrous acid. 5) Find the pOH s for the solutions in problems 1 4 above: #1) ___________________________ #2) ___________________________ #3) ___________________________ #4) ___________________________
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Everett Community College does not discriminate on the basis of race, religion, creed, color, national origin, age, sex, marital status, disability, or veteran status. pH Worksheet #2 - Solutions Note : The significant figures in the concentration of [H + ] or [OH - ] is equal to the number of decimal places in the pH or pOH and vice versa. 1) Find the pH of a 9.8 x 10
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Unformatted text preview: -4 M HI solution. pH = -log (9.8 x 10-4 ) = 3.01 2) Find the pH of a 2.76 x 10-4 M NaOH solution. pOH = -log (2.76 x 10-4 ) = 3.559 pH = 14.000 3.559 = 10.441 3) Find the pH of a solution made by diluting 35 mL of 4.5 M HNO 3 to a final volume of 2.25 L. M 1 V 1 = M 2 V 2 M 2 = M 1 V 1 = (4.5 M)(35 mL) = 0.070 M V 2 (2250 mL) pH = -log (0.070) = 1.15 4) Find the pH of 4.75 L of an aqueous solution that contains 3.20 grams of HCl and 1.85 grams of nitrous acid. 3.20 g HCl x 1 mole HCl = 0.0878 mole HCl 36.45 g HCl 1.85 g HNO 2 x 1 mole HNO 2 = 0.0394 mole HNO 2 47 g HNO 2 0.0878 mole HCl + 0.0394 mole HNO 2 = 0.1272 moles acid 0.1272 moles acid = 0.0268 M acid solution 4.75 L H 2 O pH = -log (0.0268) = 1.572 5) Find the pOHs for the solutions in problems 1 4 above: #1) pOH = 14.00 3.01 = 10.99 #2) pOH = 3.559 #3) pOH = 14.00 1.15 = 12.85 #4) pOH = 14.000 1.572 = 12.428...
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This note was uploaded on 10/04/2010 for the course CHEM 145 taught by Professor Prezhdo during the Fall '08 term at University of Washington.

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pH_wksht_2 - -4 M HI solution. pH = -log (9.8 x 10-4 ) =...

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