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14 March, 19:50

A chemist prepares a solution of silver perchlorate by measuring out of silver perchlorate into a volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's silver perchlorate solution. Round your answer to significant digits.

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  1. 14 March, 20:20
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    Complete Question:

    A chemist prepares a solution of silver (I) perchlorate (AgCIO4) by measuring out 134. g of silver (I) perchlorate into a 50. ml volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the silver (I) perchlorate solution. Round your answer to 2 significant digits.

    Answer:

    13 mol/L

    Explanation:

    The concentration in mol/L is the molarity of the solution and indicates how much moles have in 1 L of it. So, the molarity (M) is the number of moles (n) divided by the volume (V) in L:

    M = n/V

    The number of moles is the mass (m) divided by the molar mass (MM). The molar mass of silver (I) perchlorate is 207.319 g/mol, so:

    n = 134/207.319

    n = 0.646 mol

    So, for a volume of 50 mL (0.05 L), the concentration is:

    M = 0.646/0.05

    M = 12.92 mol/L

    Rounded to 2 significant digits, M = 13 mol/L
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