Anonymous asked in Science & MathematicsChemistry · 5 months ago

Need help with this chemistry homework?

A chalk contain calcium hydroxide,Ca(OH)2. This substance is use to neutralise the acidity of soil. A sample of chalk can neutralise 62.5cm^3 of nitric acid,HNO3 1.6moldm^-3 completely. Calculate the mass of the sample.

Answer given is 3.7g

1 Answer

  • Fern
    Lv 7
    5 months ago
    Favorite Answer

    62.5 cm3 x 1.6 moles HNO3/dm3 x 10^-3 dm3/1cm3 = 0.10 moles HNO3

    Ca(OH)2 x 2HNO3 =⇒ Ca(NO3)2 + 2H2O

    0.10 moles HNO3 x 1 mole Ca(OH)2/ 2mole HNO3 = 0.050 moles Ca(OH)2

    0.050 moles Ca(OH)2 x 74.0 g Ca(OH)2/1mole Ca(OH)2 = 3.7 g Ca(OH)2

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