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9 March, 04:51

You are provided with a stock solution with a concentration of 1.0x10-5 M. You will be using this to make two standard solutions via serial dilution. 1. Perform calculations to determine the volume of the 1.0x10-5 M stock solution needed to prepare 10.0 mL of a 2.0x10-6 M solution. Perform calculations to determine the volume of the 2.0x10-6 M solution needed to prepare 10.0 mL of a 5.0x10-7 M solution. You are welcome to do the calculations in your notebook prior to lab. 2. Prepare 10.0 mL of a 2.0x10-6 M solution using a graduated cylinder. Transfer the solution to a clean 50 mL beaker. 3. Prepare 10.0 mL of a 5.0x10-7 M solution using a graduated cylinder. Transfer the solution to a clean 50 mL beaker.

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  1. 9 March, 05:29
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    1. V₁ = 2.0 mL

    2. V₁ = 2.5 mL

    Explanation:

    You are provided with a stock solution with a concentration of 1.0 * 10⁻⁵ M. You will be using this to make two standard solutions via serial dilution.

    To calculate the volume required (V₁) in each dilution we will use the dilution rule.

    C₁. V₁ = C₂. V₂

    where,

    C are the concentrations

    V are the volumes

    1 refers to the initial state

    2 refers to the final state

    1. Perform calculations to determine the volume of the 1.0 * 10⁻⁵ M stock solution needed to prepare 10.0 mL of a 2.0 * 10⁻⁶ M solution.

    C₁. V₁ = C₂. V₂

    (1.0 * 10⁻⁵ M). V₁ = (2.0 * 10⁻⁶ M). 10.0 mL

    V₁ = 2.0 mL

    2. Perform calculations to determine the volume of the 2.0 * 10⁻⁶ M solution needed to prepare 10.0 mL of a 5.0 * 10⁻⁷ M solution.

    C₁. V₁ = C₂. V₂

    (2.0 * 10⁻⁶ M). V₁ = (5.0 * 10⁻⁷ M). 10.0 mL

    V₁ = 2.5 mL
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