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5 May, 15:12

A student prepares a weak acid solution by dissolving 0.2000 g HZ to give 100. mL solution. The titration requires 33.5 mL of 0.1025 M NaOH. Calculate the molar mass of the acid. WebAssign will check your answer for the correct number of significant figures. g/mol (a) Would the molar mass be too high, too low, or unaffected if the student accidentally used 0.1000 g in the calculation

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  1. 5 May, 18:48
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    a) M=0.20 / (0.335*0.1025) = 0.20 / 0.034 = 5.88 g/mol

    b) if 0.100g is used instead of 0.200g

    M = 0.1 / 0.034 = 2.94 hence the molar mass will be too low

    Explanation:

    0.2000 gHZ gives 100ml acid solution

    33.5 ml of 0.1025 M NaOH is required to prepare it

    the moles = mass / molar mass

    mass = 0.200 gHZ

    moles = 0.0335*100 * 0.1025 = 0.034

    therefore molar mass = mass / moles

    M=0.20 / (0.335*0.1025) = 0.20 / 0.034 = 5.88

    if 0.100g is used instead of 0.200g

    M = 0.1 / 0.034 = 2.94 hence the molar mass will be too low
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