A, 0.30 g of hydrogen chloride ( H C l ) is dissolved in water to make 6.5 L of
ID: 820749 • Letter: A
Question
A, 0.30g of hydrogen chloride (HCl) is dissolved in water to make 6.5L of solution. What is the pH of the resulting hydrochloric acid solution? Express the pH numerically to two decimal places. B, 0.90g of sodium hydroxide (NaOH) pellets are dissolved in water to make 5.0L of solution. What is the pH of this solution? Express the pH numerically to two decimal places. A, 0.30g of hydrogen chloride (HCl) is dissolved in water to make 6.5L of solution. What is the pH of the resulting hydrochloric acid solution? Express the pH numerically to two decimal places. B, 0.90g of sodium hydroxide (NaOH) pellets are dissolved in water to make 5.0L of solution. What is the pH of this solution? Express the pH numerically to two decimal places. B, 0.90g of sodium hydroxide (NaOH) pellets are dissolved in water to make 5.0L of solution. What is the pH of this solution? Express the pH numerically to two decimal places.Explanation / Answer
A.
Molarity = (w/M)x1000/V = (0.3/36.5)x1000/6500 = 1.2 x 10^-3 M
pH = -log[H+] = -log(1.2 x 10^-3) = 2.89
B.
molarity = (w/M)x1000/V = (0.9/40)x1000/5000 = 4.5 x 10^-3 M
pOH = -log[OH-] = -log(4.5 x 10^-3 M) = 2.34
pH = 14-pOH = 14-2.34 = 11.66