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    Chemistry applied practical situations - pH of soil

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    Assume that Isaac Asimov's figures are correct, and that 3.5 X 10 to the 14th power of the 3.0 X 10 to the 26th power carbon atoms in your body are radioactive. Calculate the fraction of carbon atoms that are radioactive carbon-14.

    Natural sources of radiation account for 82 % of all public exposure while human-made sources account for 18%.

    24a. A garden product called "Dolomite Lime" is composed of tiny chips of limestone that contain both calcium and magnesium carbonates. This product is "intended to help the gardener correct the pH of acid soils," as it is "a valuable source of calcium and magnesium."

    a. Write the chemical formulas for magnesium carbonate and calcium carbonate. In what form is the calcium in this compound, calcium ion or calcium metal?

    b. Write a chemical equation that shows why limestone "corrects" the pH of acid soils.

    c. Will the addition of Dolomite Lime to soils cause the pH to rise or fall?

    d. Plants such as rhododendrons, azaleas, and camellias should not be given dolomite lime. Name a possible reason why.

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    24a. A garden product called "Dolomite Lime" is composed of tiny chips of limestone that contain both calcium and magnesium carbonates. This product is "intended to help the gardener correct the pH of acid soils," as it is "a valuable source of calcium and magnesium."

    a. Write the chemical formulas for magnesium carbonate and calcium carbonate. In what form is the calcium in this compound, calcium ion or calcium metal?

    Magnesium Carbonate: MgCO3 Calcium Carbonate: CaCO3

    Calcium is present in the ion form in this compound

    b. Write a chemical equation that shows why limestone "corrects" the pH of acid soils.

    Lime stone is CaCO3

    In an acidic soil, concentration of H+ ions will be higher.

    Writing the reaction of caco3 with H+ and the anion (for example Cl- if it is HCl)

    2H+ + CaCO3  Ca2+ + H2O + CO2

    Results will be water, carbondioxide and Calcium ion. This will reduce the hydrogen ion concentration and therefore the acidity

    c. Will the addition of Dolomite Lime to soils cause the pH to rise or fall?

    Dolomite is a double carbonate of calcium and magnesium. (Ca,Mg)CO3

    Since this is carbonate of Mg and Ca, the acidity of the soil will fall. That means, the pH of the soil will increase.

    d. Plants such as rhododendrons, azaleas, and camellias should not be given dolomite lime. Name a possible reason why.

    The above fact may be applied here. The plants can grow healthily in acidic soil only. When dolomite is added, acidity is decreased.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 4:53 pm ad1c9bdddf>
    https://brainmass.com/chemistry/acids-and-bases/chemistry-applied-practical-situations-ph-soil-13222

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