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Chemistry is pH un! pH and pOH This is Sooo Basic!. pH Scale. Chemistry is pH un!. pH and pOH. p H = “power” of Hydrogen H + Molarity. p OH = “power” of Hydroxide OH - Molarity. p H use H + M as 10 -x p H = - (- x ) = x.
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Chemistry is pHun! pH and pOH This is Sooo Basic!
Chemistry is pHun! pH and pOH pH = “power” of Hydrogen H+ Molarity pOH = “power” of Hydroxide OH- Molarity pH use H+ M as 10-x pH = - (-x) = x pOH use OH- M as 10-x pOH = -(-x)= x
H20 H+ + OH- pure water is neutral; that is, it ionizes in such a manner that : Molarity of H+ = Molarity of OH- = 10-7M
pH Scale: pH < 7.00 is acidic pH = 7.00 is neutral goes from 0 → 14 pH > 7.00 is basic pH + pOH = 14
Steps To Finding pH & pOH: • Examine the formula of the compound. If the compound has H+ in the formula then that solution is an acid. This will give you the pH. If the compound has OH in it then that compound is a base and will give you the pOH. • Next write the concentration (Molarity) as a “power of ten as 1 x 10-X X = # of decimal places. • The positive number for X will be the pH if an acid or pOH if a base. Find the other by subtracting the one you found from 14. pH + pOH = 14.
Determine the pH and pOH of: a. 0.001 M HNO3 b. 0.00001 M HCl a. 0.001 M H+ = 1 x 10-3M H + pH= 3 pOH = 11 b. 0.00001 M H+ = 1 x10-5M H+ pOH = 9 pH= 5
Practice What is the pH ( and pOH) of a solution with [H+] of: • 0.000000000001 M • 0.000001 M • 0.000000001 M
a) 1 x 10-12 = [H+] pH = 12 pOH = 14 – pH = 2 b) 1 x 10-6 = [H+] pH = 6 pOH = 14 – pH = 8 c) 1 x 10-9 = [H+] pH = 9 pOH = 14 – pH = 5
Practice Determine the pH (and pOH) for the following solutions: • 1.0 x 10-5MHNO3 • 1.0 x 10-6M KOH
a) 1.0 x 10-5 = [H+] HNO3 pH = 5 pOH = 14 – pH = 9 b) 1.0 x 10-6 = [OH-] KOH pOH = 6 pH = 14 – pOH = 8
Practice Problems: Find the pH and pOH of these items: • Orange Juice H+ = 0.0001 M • Vinegar H+ = 0.001 M • Black Coffee H+ = 0.000001 M • Ammonia H+ = 0.00000000001 M • Baking Soda H+ = 0.000000001 M • Stomach Acid H+ = 0.1 M
Practice Problems: Find the pH and pOH of these items: • H+ = 1 x 10-4 M pH = 4 pOH = 10 • H+ =1 x 10-3 M pH = 3 pOH = 11 • H+ = 1x 10-6 M pH = 6 pOH = 8 • H+ = 1 x 10-11 M pH = 11 pOH = 3 • H+ = 1 x 10-8 M pH = 8 pOH = 6 • H+ = 1 x 10-1 M pH = 1 pOH = 13
Practice Problems: Find the pH and pOH of these solutions: • OH- = 0.0001 M • OH- = 0.001 M • OH- = 0.000001 M • OH- = 0.00000000001 M • OH- = 0.000000001 M • OH- = 0.1 M
Practice Problems: Find the pH and pOH of these solutions: • OH- = 1 x 10-4 M pOH = 4 pH = 10 • OH- = 1 x 10-3 M pOH = 3 pH = 11 • OH- = 1 x 10 -6 M pOH = 6 pH = 8 • OH- = 1 x 10-11 M pOH =11 pH = 3 • OH- = 1 x 10-9 M pOH = 9 pH = 5 • OH- = 1x 10-1 M pOH = 1 pH = 13
Quiz Determine the pH and pOH for the following solutions: • 0.00001 M CsOH • 0.01 M HF
Quiz Determine the pH and pOH for the following solutions: • 0.00001 M CsOH 1 x 10-5 pOH = 5 pH = 9 • 0.01 MHF 1 x 10-2 pH =2 pOH =12