You test bleach (pH 13) with red litmus paper. What color would you expect to se

Question

You test bleach (pH 13) with red litmus paper. What color would you expect to see?

Green

Blue

Red

Yellow

Question 2

Select one answer.

Which of these is closest to a neutral pH?

baking soda, pH 8.5

ammonia, pH 12

stomach acid, pH 1

black coffee, pH 5

Question 3

Select one answer.

Buffers: _____________________________.

make solutions more basic

resist changes in pH

make solutions more acidic

Question 4

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What is the pH of bleach?

very acidic

slightly acidic

slightly basic

very basic

Question 5

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What is the pH of lemon juice?

very acidic

slightly acidic

slightly basic

very basic

Question 6

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A solution with a pH of 4 has how many H+ ions compared to a solution with a pH of 6?

100 times less

1000 times less

1000 times more

100 times more

two thirds as many

Question 7

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Solution A has a lower concentration of H+ than solution B. Solution A is

more acidic

more basic

more neutral

Question 8

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A small amount of acid is added to a buffered solution. What will happen?

The pH will decrease rapidly after acid is added.

The pH will increase rapidly after acid is added.

The pH will change very little, if at all. The buffer will accept the hydrogen ions from the added acid, keeping pH constant.

The pH will change very little, if at all. The buffer will donate extra hydrogen ions to the solution to keep the pH constant.

Question 9

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pH is a measure of

toxicity

chemical reactivity

electrical charge

hydrogen ions

Question 10

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The pH of a substance is determined by measuring the ____________ of the substance.

toxicity

chemical reactivity

hydrogen ions

electrical charge

Explanation / Answer

1. blue
2. baking soda, pH 8.5
3.
4. very basic (around 12)
5. very acidic
6. 100 times more (lower the pH more is the H+ concentration)
7. more basic
8. The pH will change very little, if at all. The buffer will accept the hydrogen ions from the added acid, keeping pH constant.

9. hydrogen ions

10. hydrogen ions

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