pH is a logarithmic scale used to indicate the hydrogen ion concentration, [H+], of a solution:
pH = -log[H+]
Due to the autoionization of water, in any aqueous solution, the hydrogen ion concentration and the hydroxide ion concentration, [OH-], are related to each other by the Kw of water:
Kw = [H+][OH-] = 1.00 x 10-14
where 1.00 x 10-14 is the value at approximately 297 K. Based on this relation, the pH and pOH are also related to each other as
14.00 = pH + pOH
The temperature for each solution is carried out at approximately 297 K where Kw = 1.00 x 10-14
Part A
0.85 g of hydrogen chloride (HCl) is dissolved in water to make 6.5 L of solution. What is the pH of the resulting hydrochloric acid solution?
Part B
0.40 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 5.5 L of solution. What is the pH of this solution?
Part C
What is the pOH of the solution in Part B?
C)
pH of solution = 11.26
Use:
POH = 14 - pH
= 14 - 11.26
= 2.74
Answer: 2.74
pH is a logarithmic scale used to indicate the hydrogen ion concentration, [H+], of a solution:
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