Chemistry: pH GRADE A Q&A
pH - (correct answer)How can we quantify how acidic or how basic a substance is? We
can use tools such as pH meters and litmus paper.
Review Acids and Bases - (correct answer)Acids
- taste sour
- turn blue litmus paper red
- reacts with metals to produce hydrogen gas
- react with carbonates or bicarbonates to produce carbon dioxide gas
- react with bases
Bases
- taste bitter
- are slippery to touch
- turn red litmus paper blue
- turn phenolphthalein pink
- react with carbon dioxide to produce carbonates
- react with metal salts to produce insoluble hydroxides
- react with acids
Distinguishing Acids and Bases - (correct answer)A student crushes some calcium
supplement tablets and dissolves them in water. The resulting solution feels slippery
and has a slightly bitter taste. Are the supplement tablets most likely to be acids or
bases?
- bases
, Limestone is made of calcium carbonate, CaCO3. Would you use an acid or a base to
test a rock sample to determine whether it contains calcium carbonate?
- acid
How can you express the concentration of hydrogen and hydronium ions in a solution? -
(correct answer)pH
- tests the acidity, alcalinity, or basisity of a solution
pH (power of hydrogen) - (correct answer)pH (quantitative)
- a measure of the hydronium ion concentration in an aqueous solution
pH = -log(H+)
Acidic
- pH < 7
Basic (alkaline)
- pH > 7
Neutral
- pH = 7
Common pH values - (correct answer)Household bleach
- pH = 13 (very basic/alkaline)
Ammonia-based window cleaner
- pH = 11 (alkaline)
Blood
pH - (correct answer)How can we quantify how acidic or how basic a substance is? We
can use tools such as pH meters and litmus paper.
Review Acids and Bases - (correct answer)Acids
- taste sour
- turn blue litmus paper red
- reacts with metals to produce hydrogen gas
- react with carbonates or bicarbonates to produce carbon dioxide gas
- react with bases
Bases
- taste bitter
- are slippery to touch
- turn red litmus paper blue
- turn phenolphthalein pink
- react with carbon dioxide to produce carbonates
- react with metal salts to produce insoluble hydroxides
- react with acids
Distinguishing Acids and Bases - (correct answer)A student crushes some calcium
supplement tablets and dissolves them in water. The resulting solution feels slippery
and has a slightly bitter taste. Are the supplement tablets most likely to be acids or
bases?
- bases
, Limestone is made of calcium carbonate, CaCO3. Would you use an acid or a base to
test a rock sample to determine whether it contains calcium carbonate?
- acid
How can you express the concentration of hydrogen and hydronium ions in a solution? -
(correct answer)pH
- tests the acidity, alcalinity, or basisity of a solution
pH (power of hydrogen) - (correct answer)pH (quantitative)
- a measure of the hydronium ion concentration in an aqueous solution
pH = -log(H+)
Acidic
- pH < 7
Basic (alkaline)
- pH > 7
Neutral
- pH = 7
Common pH values - (correct answer)Household bleach
- pH = 13 (very basic/alkaline)
Ammonia-based window cleaner
- pH = 11 (alkaline)
Blood
