A chemist dissolves 797. mg of pure barium hydroxide in enough water to make up 60. mL of solution. Calculate the pH of the solution. (The t

Question

A chemist dissolves 797. mg of pure barium hydroxide in enough water to make up 60. mL of solution. Calculate the pH of the solution. (The temperature of the
solution is 25 °C.)
Round your answer to 2 significant decimal places.

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King 5 years 2021-07-15T14:12:01+00:00 1 Answers 37 views 0

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  1. kiet
    0
    2021-07-15T14:13:58+00:00
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    Answer:

    13.20

    Explanation:

    Step 1: Calculate the moles of Ba(OH)₂

    The molar mass of Ba(OH)₂ is 171.34 g/mol.

    0.797 g × 1 mol/171.34 g = 4.65 × 10⁻³ mol

    Step 2: Calculate the molar concentration of Ba(OH)₂

    Molarity is equal to the moles of solute divided by the liters of solution.

    [Ba(OH)₂] = 4.65 × 10⁻³ mol/60 × 10⁻³ L = 0.078 M

    Step 3: Calculate [OH⁻]

    Ba(OH)₂ is a strong base according to the following equation.

    Ba(OH)₂ ⇒ Ba²⁺ + 2 OH⁻

    The concentration of OH⁻ is 2/1 × 0.078 M = 0.16 M

    Step 4: Calculate the pOH

    pOH = -log OH⁻ = -log 0.16 = 0.80

    Step 5: Calculate the pH

    We will use the following expression.

    pH + pOH = 14

    pH = 14 – 0.80 = 13.20

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