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14 Cards in this Set
- Front
- Back
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Rainwater is naturally a weak acid or alkali?
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Acid
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What is the acid in rainwater?
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Carbonic acid
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How do Calcium ions get into rainwater?
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When the rain falls, it flows over rocks or soaks into the ground and then passes through layers of rock.
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Hard water contains what sort of compounds?
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Dissolved compounds
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What are the usual compounds in hard water?
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Magnesium and calcium
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Does soft water cause a good or bad lather?
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Good
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What is produced when calcium and magnesium ions react with soap?
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Scum
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Do soapless detergents form scum with hard water?
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No
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Does the type of rock found in different regions determine how hard or soft the water will be?
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Yes
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How can you measure the hardness of water?
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A titration with soap
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How can temporary hard water be softened?
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By boiling it
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Can you soften permanent hard water?
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No, it stays hard even when boiled
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Temporary hard water contains what ions?
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Dissolved hydrogen carbonate ions, HCO3
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Permanent hard water contains what ions?
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Dissolved sulfate ions, SO4
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