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The drinking water standard for nitrate is 10 mg/L as N (i.e., drinking waters should not exceed this value). What quantity of nitrate ion does this concentration represent?

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Answer:

This concentrations represents 9.71 x 10¹⁹  nitrate ions per litre of drinking water.

Explanation:

Nitrate: NO₃⁻

MW = 62.00 g/mol

1 mol = 6.022 x 10²³

62 g  NO₃⁻ ____________ 6.022 x 10²³ ions

10 x 10⁻³ g NO₃⁻ _________ x

x = 9.71 x 10¹⁹ ions

This concentrations represents 9.71 x 10¹⁹  nitrate ions per litre of drinking water.

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