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