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25 October, 07:47

Calculate the concentration of all ions present in each of the following solutions of strong electrolytes. a. 0.100 mole of Ca (NO3) 2 in 100.0 mL of solution

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  1. 25 October, 11:27
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    [Ca²⁺] = 1M

    [NO₃⁻] = 2M

    Explanation:

    Calcium nitrate dissociates in water as follows:

    Ca (NO₃) ₂ ⇒ Ca²⁺ + 2NO₃⁻

    The moles of Ca²⁺ can be found using the molar relationship between Ca (NO₃) ₂ and Ca²⁺

    (0.100mol Ca (NO₃) ₂) (Ca²⁺ / Ca (NO₃) ₂) = 0.100 mol Ca²⁺

    The concentration of Ca²⁺ is then:

    [Ca²⁺] = n/V = (0.100mol) / (100.0mL) x (1000ml) / (1L) = 1M

    Similarly, moles of NO₃⁻ can be found using the molar relationship between Ca (NO₃) ₂ and NO₃⁻:

    (0.100mol Ca (NO₃) ₂) (2NO₃⁻/Ca (NO₃) ₂) = 0.200 mol NO₃⁻

    The concentration of NO₃⁻ is then:

    [NO₃⁻] = (0.200mol) / (100.0mL) x (1000ml) / (1L) = 2M
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