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9 April, 01:59

What is the pH of a solution made by mixing 200 mL of 0.025M HCl and 150 mL of 0.050 M HCl?

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  1. 9 April, 05:54
    0
    The answer to your question is pH = 1.45

    Explanation:

    Data

    pH = ?

    Volume 1 = 200 ml

    [HCl] 1 = 0.025 M

    Volume 2 = 150 ml

    [HCl] 2 = 0.050 M

    Process

    1. - Calculate the number of moles of each solution

    Solution 1

    Molarity = moles / volume

    -Solve for moles

    moles = 0.025 x 0.2

    result

    moles = 0.005

    Solution 2

    moles = 0.050 x 0.15

    -result

    moles = 0.0075

    2. - Sum up the number of moles

    Total moles = 0.005 + 0.0075

    = 0.0125

    3. - Sum up the volume

    total volume = 200 + 150

    350 ml or 0.35 l

    4. - Calculate the final concentration

    Molarity = 0.0125 / 0.35

    = 0.0357

    5. - Calculate the pH

    pH = - log [H⁺]

    -Substitution

    pH = - log[0.0357]

    -Result

    pH = 1.45
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