Multiple Choice
What is the pH of a solution made by mixing 0.30 mol NaOH, 0.25 mol Na2HPO4, and 0.20 mol H3PO4 with water and diluting to 1.00 L?
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17. Acid and Base Equilibrium
pH of Strong Acids and Bases
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What is the pH of a 0.02 M NaOH solution?
A
13.00
B
1.70
C
12.30
D
7.00
Verified step by step guidance1
Identify that NaOH is a strong base, which means it completely dissociates in water. The dissociation can be represented as: NaOH → Na⁺ + OH⁻.
Determine the concentration of hydroxide ions (OH⁻) in the solution. Since NaOH completely dissociates, the concentration of OH⁻ ions is equal to the concentration of NaOH, which is 0.02 M.
Use the formula for pOH, which is pOH = -log[OH⁻]. Substitute the concentration of OH⁻ (0.02 M) into this formula to find the pOH.
Recall the relationship between pH and pOH, which is given by the equation: pH + pOH = 14. Use this equation to solve for pH by substituting the calculated pOH value.
Calculate the pH using the relationship from the previous step. This will give you the pH of the NaOH solution.
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