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Chemistry is pH un! pH and pOH This is Sooo Basic!

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 pH un! pH and pOH This is Sooo Basic!

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  1. Chemistry is pHun! pH and pOH This is Sooo Basic!

  2. pH Scale

  3. 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

  4. H20 H+ + OH- pure water is neutral; that is, it ionizes in such a manner that : Molarity of H+ = Molarity of OH- = 10-7M

  5. pH Scale: pH < 7.00 is acidic pH = 7.00 is neutral goes from 0 → 14 pH > 7.00 is basic pH + pOH = 14

  6. 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.

  7. 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

  8. Practice What is the pH ( and pOH) of a solution with [H+] of: • 0.000000000001 M • 0.000001 M • 0.000000001 M

  9. 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

  10. Practice Determine the pH (and pOH) for the following solutions: • 1.0 x 10-5MHNO3 • 1.0 x 10-6M KOH

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. Quiz Determine the pH and pOH for the following solutions: • 0.00001 M CsOH • 0.01 M HF

  17. 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

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