Just question 5 pls. 5) Calculate the concentration of OH\' in a solution that c
ID: 543961 • Letter: J
Question
Just question 5 pls.
5) Calculate the concentration of OH' in a solution that contains 3.9 × 10-4 M H30+ at 25°C. Identify the solution as acidic, basic or neutral A) 2.7 × 10-2 M, acidic D) 2.6 x 10-11 M, basic B) 2.7 × 10-2 M, basic E) 2.6 × 10-11 M, acidic C) 3.9 × 10-4 M, acidic 6) Calculate the pH of a solution that contains 2.4 x 10-5 M H30 at 25°C. A) 4.62 B)9.38 C699 D) 9.41 E) 0.59 7) Calculate the pH of a solution that contains 7.8 × 10-6 M OH' at 25°C. A) 1.28 B)5.1 C) 12.72 D)8.89 E) 9.64Explanation / Answer
5) pH=-log [H+]
[H3O+]=3.9X10-4
pH=-log 3.9X10-4
pH=3.4089
pH+pOH=14
pOH=14-3.4089
pOH=10.5911
[-OH]=10pOH
OH concentration is 2.6x10-11 as acidic due to pH below 7
6) [H3O+]=2.4X10-5
pH=-log 2.4X10-5
pH=4.62
7) pOH=-log [-OH]
pOH=-log [7.8X10-6]
pOH=5.108
pH+pOH=14
14-5.108=pH
pH=8.89
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