Answer the following questions in the field below. Please proceed each of your answers with the question number in parentheses. For example,

(1) pH = 12

or

(6b) acid

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1. Which of the following pH values indicate an acidic solution? Which are basic and which are neutral?

  (a) 11.2

  (b) 7.0 

  (c) 1.2 

  (d) 6.1

2. For each of the following, state whether the solution is acidic, neutral, or basic:

 (a) A beverage solution has a pH of 3.5

 (b) A 0.50 M solution of potassium bromide, KBr, has a pH of 7.0

 (c) A 0.050 M solution of pyridine, C5H5N, has a pH of 9.0.

 (d) A solution of iron(III) chloride has a pH of 5.5.

3. Obtain the pH corresponding to the following hydrogen-ion concentrations.

  (a) 1.0 x 10^-8M

  (b) 5.0 x 10^-12M

  (c) 7.5 x 10^-3M

  (d) 6.35 x 10^-9M

4. A sample of vinegar has a hydrogen-ion concentration of 7.5 x 10^-3M. What is the pH of the vinegar?

5. A solution of washing soda (sodium carbonate, Na2CO3) has a hydroxide-ion concentration of 0.0040 M. What is the pH?

6. The pH of a cup of coffee was found to be 5.12. What is the hydrogen-ion concentration?

7. A detergent solution has a pH of 11.63. What is the hydroxide-ion concentration?

8. A 1.00-L aqueous solution contained 5.80 g of sodium hydroxide, NaOH. What was the pH of the solution?

9. A certain sample of rainwater gives a yellow color with thymol blue, and a blue color in methyl blue. Using a table of acid/base indicators, you see the following data:

thymol blue:yellow< 10.5<blue

methyl blue:red< 3.5 < blue

Can you determine whether the rainwater is acidic, basic, or neutral? Explain.