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31 March, 00:58

A 0.1025-g sample of copper metal is dissolved in 35 ml of concentrated hno3 to form cu2 ions and then water is added to make a total volume of 200.0 ml. (calculate the molarity of cu2.)

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  1. 31 March, 02:24
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    Molarity is defined as number of moles of solute in 1 L of solution.

    Here, 0.1025 g of Cu is reacted with 35 mL of HNO_{3} to produced Cu^{2+} ions.

    The balanced reaction will be as follows:

    Cu+3HNO_{3}/rightarrow Cu (NO_{3}) _{2}+NO_{2}+H_{2}O

    From the above reaction, 1 mole of Cu produces 1 mole of Cu^{2+}, convert the mass of Cu into number of moles as follows:

    n=/frac{m}{M}

    molar mass of Cu is 63.55 g/mol thus,

    n=/frac{0.1025 g}{63.55 g/mol}=0.0016 mol

    Now, total molarity of solution, after addition of water is 200 mL or 0.2 L can be calculated as follows:

    M=/frac{n}{V}=/frac{0.0016 mol}{0.2 L}=0.008 mol/L=0.008 M

    Thus, molarity of Cu^{2+} is 0.008 M.
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