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6 July, 01:16

Acetylsalicylic acid is the active ingredient in aspirin. It took 35.17 mL of 0.5065 M sodium hydroxide to react completely with 3.210 g of acetylsalicylic acid. Acetylsalicylic acid has one acidic hydrogen. What is the molar mass of acetylsalicylic acid?

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  1. 6 July, 04:46
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    the molar mass of Acetylsalicylic acid is 180.2 g.

    Explanation:

    Knowing that Acetylsalicylic acid (AA-H) has one acidic proton, we can write the equation for the reaction with NaOH as follows:

    AA-H + NaOH → AA-Na + H₂O (underlined is the acidic proton)

    From the equation, we know that 1 mol NaOH reacts with 1 mol AA-H.

    The moles of NaOH that react with AA-H can be calculated using the data provided by the problem since we have the volume and the concentration of the NaOH used:

    mol NaOH = V * C where V = volume and C = concentration.

    The molar concentration (M) is the number of moles present in 1 liter solution, then, the NaOH solution used has 0.5065 mol NaOH in 1000 ml.

    The moles of NaOH used in the reaction can be calculated this way:

    mol NaOH = 35.17 ml * (0.5065 mol / 1000 ml) = 0.01781 mol

    Then, because 1 mol NaOH reacts with 1 mol AA-H, there must be 0.01781 mol AA-H that react with 0.01781 mol NaOH.

    This number of mol of AA-H has a mass of 3.210 g according to the information provided by the problem. Then the mass of a single mol (the molar mass) must be:

    molar mass = 1 mol * 3.210 g / 0.01781 mol = 180.2 g
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