module 5 - PH Scale and strong acids Flashcards
what does PH measure?
hydrogen ion concentration
what does a low value of H+ match in terms of PH?
matches a high value of PH
what does a high value of H+ concentration match in terms of PH?
matches a low value of PH
what’s the mathsy relationship between PH and H+ concentration? what’s the reverse equation?
pH = -log[H+]
[H+] = 10^ -pH
what does the probe of a pH meter contain?
an electrode that measures the electrical potential of the h+ ions
to dilute a slolution of ph 1 to ph 4, how many times dilution is needed
1000 times
how many more h+ does a solution with ph 1 contain that a solution of ph 14?
10^13 times more
what does a strong monobasic acid do in solution?
completely dissociate
what is the symbol for strong monobasic acid?
HA
HA(aq) —> ?
H+ + A-
for a strong acid, what is [H+] = to?
[HA(aq)]
for a strong acid, why is [H+(aq)] = [HA(aq)]
because a strong acid completely dissociates in aqueous solution
what can the pH of a strong acid be calculated from?
directly from its concentration
what are the 2 steps in calculating pH from acid concentration? what type of acid does this only work for?
1) convert acid concentration into h+ ion conc.
2) use calc to find pH
- works for strong acid
give examples of 2 strong acids?
HCl & HNO3
what are the 2 steps in calculating acid conc. from pH?
1) find h+ with calc.
2) convert h+ into HA
how many sig figs is 2.66?
only 2
how many dp do you round ph to?
2
a ph of 1 has 10 times the concentration of H+ ions as a solution with a ph of????
2
how do you find change in pH on dilution for strong acids?
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
if a concentration is halved , what factor has it changed by?
factor of 2
