module 5 - PH Scale and strong acids

Question 1

what does PH measure?

Answer 1

hydrogen ion concentration

Question 2

what does a low value of H+ match in terms of PH?

Answer 2

matches a high value of PH

Question 3

what does a high value of H+ concentration match in terms of PH?

Answer 3

matches a low value of PH

Question 4

what’s the mathsy relationship between PH and H+ concentration? what’s the reverse equation?

Answer 4

pH = -log[H+]

[H+] = 10^ -pH

Question 5

what does the probe of a pH meter contain?

Answer 5

an electrode that measures the electrical potential of the h+ ions

Question 6

to dilute a slolution of ph 1 to ph 4, how many times dilution is needed

Answer 6

1000 times

Question 7

how many more h+ does a solution with ph 1 contain that a solution of ph 14?

Answer 7

10^13 times more

Question 8

what does a strong monobasic acid do in solution?

Answer 8

completely dissociate

Question 9

what is the symbol for strong monobasic acid?

Answer 9

HA

Question 10

HA(aq) —> ?

Answer 10

H+ + A-

Question 11

for a strong acid, what is [H+] = to?

Answer 11

[HA(aq)]

Question 12

for a strong acid, why is [H+(aq)] = [HA(aq)]

Answer 12

because a strong acid completely dissociates in aqueous solution

Question 13

what can the pH of a strong acid be calculated from?

Answer 13

directly from its concentration

Question 14

what are the 2 steps in calculating pH from acid concentration? what type of acid does this only work for?

Answer 14

1) convert acid concentration into h+ ion conc.
2) use calc to find pH
- works for strong acid

Question 15

give examples of 2 strong acids?

Answer 15

HCl & HNO3

Question 16

what are the 2 steps in calculating acid conc. from pH?

Answer 16

1) find h+ with calc.

2) convert h+ into HA

Question 17

how many sig figs is 2.66?

Answer 17

only 2

Question 18

how many dp do you round ph to?

Answer 18

2

Question 19

a ph of 1 has 10 times the concentration of H+ ions as a solution with a ph of????

Answer 19

2

Question 20

how do you find change in pH on dilution for strong acids?

Answer 20

1) find conc of diluted thing
2) find pH b4 ad after dilution using calc and the concentration of acids b4 and after.
3) find the difference between them for ur answer

Question 21

if a concentration is halved , what factor has it changed by?

Answer 21

factor of 2