Question

For a solution with an [oh−] of 10−8 m, what would be the value of [h+] , ph and poh, respectively? 1. 106 m, 6, 8 2. 10−6 m, 6, 8 3. 10−6 m, 8, 6 4. 10−14 m, 6, 8 5. 10−6 m, 6, 14 6. 10−14 m, 8, 6

Answer 1

Q1)pOH
the hydroxide ion concentration can be used to calculate the pOH of the solution 
pOH can be calculated using the following equation 
pOH = -log[OH⁻]
pOH = -log (10⁻⁸ M)
pOH = 8
therefore pOH of solution is 8

Q2) pH 
by knowing the pOH value we can calculate the pH value
since
pH + pOH = 14
and pOH = 8
therefore pH = 14 - 8
pH = 6

Q3)
pH scale is used to determine how acidic or basic a solution is
knowing the pH value we can calculate hydrogen ion concentration 
pH = -log[H⁺]
[H⁺] = antilog(-pH)
[H⁺] = antilog(-6)
[H⁺] = 10⁻⁶ M

answer is 2. 10⁻⁶ M, 6, 8