1) A solution that is at a pH of 8 _____ solution with a pH of 1. a)has fewer hy

Question

1) A solution that is at a pH of 8 _____ solution with a pH of 1.

a)has fewer hydrogen ions than a b) has more hydrogens ions than a c) has an equal number of hydrogen ions as that of a d) is less concentrated than a

2) Which of the following pH values represents the greatest concentration of hydrogen ions?

a) 2 b) 4 c) 7 d) 10

3) A solution with a hydrogen ion concentration of 0.00001 is how many times more acidic than a solution with a hydrogen ion concentration of 0.0000000001?

a) 5 b) 10000 c) 100000 d) 500000

4) How many times more acidic is pH 3.475 compared to pH 7.475? a) 4 b) 1000 c) 4000 d) 10000

5) Pretend that substance X^2- is a buffer and will bind to 4 hydrogen ions. After binding to 4 hydrogen ions, what will the buffer look like?

6) A buffer is any solution that will bond or release _____ and therefore resist changes in _______.

7) Which statement is correct?

a) The greater the number of hydrogen ions in a solution, the lower the pH value. OR b) The greater the number of hydrogen ions, the higher the pH value.

8) If a buffer needed to remove hydrogen ions from a solution that meant that the solution has a pH that was_____.

a) too high b) too low

9) What has to happen to the hydrogen atom in order for it to become a proton?

Explanation / Answer

pH= -log [H+]

for pH= 8, [H+] =10-8 and for pH= 1, [H+] =10-1

So a solution of pH=8 will have less hydrogen ions than a solution having pH=1

b)since pH= -log[H+], lower pH values represent hydrogen ion concentrations. Hence pH=2 represents higher hydrogen concentration

c) A solution with a hydrogen ion concentration of 0.00001 is how many times more acidic than a solution with a hydrogen ion concentration of 0.0000000001 (0.00001/ 0.0000000001)=10000 times

d) pH= -log [H+] , for pH= 3.475 [H+] =10(-3.475) =0.000335

for 7.475, [H+] =10(-7.475)= 3.35*10-8

Ratio = 0.000335/3.35*10-8 =10000 ( d is correct)

e) X2H4

f) hydrogen ions and resist change in pH

g) The greater the number of hydorgne ions , the lower the pH, since pH= -log[H+]

h) if a buffer is needed to remove hydrogen ion from solution the solution the solution has a pH which is too high

i) it has to loose electrons. Sicne hydrogen atom contains 1 proton and 1 electron

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