Worksheet: More Fun with pH
KEY
Name______________
Show all work and circle your final answer.
1. What is the pH of a 0.020M HCl solution?
(
pH = ! log "# H + $% = ! log "# 2.0 & 10 !2 $% = ! !1.7
)
pH = 1.7
2. Determine the pH of a 0.035M H2SO4 solution.
(
pH = ! log "# H + $% = ! log "#(2)(3.5 & 10 !2 ) $% = ! !1.2
)
pH = 1.2
3. The pH of a 0.010M Mg(OH)2 solution is ______.
(
pH = ! log "# H + $% = ! log "#(2)(3.5 & 10 !2 ) $% = ! !1.2
(
pH = ! log "# H + $% = ! log "# 5.0 & 10 !13 $% = ! !12.3
)
)
pH = 1.2
pH = 12
4. Human blood has a pH of 7.4. Calculate both the the [H+] and [OH-]
concentration.
pH = ! log "# H + $%
7.4 = ! log "# H + $%
! H + # !OH % # = 1.0 & 10 %14
" $"
$
! 7.4 = log "# H + $%
" H + $ = 4.0 & 10 !8 M
# %
!4.0 & 10 %8 # !OH % # = 1.0 & 10 %14
"
$"
$
!OH % # = 2.5 & 10 %7 M
"
$
5. The greater the [H+] concentration, the (higher, lower) the pH.
6. An aqueous base has a pH of 8.1. Another has a pH of 10. Which solution has
the larger concentration of [OH-] ions? The solution with a pH- of 10 has the larger
concentration of [OH ] ions.
7. If a solution is (acidic, neutral, basic) the [H+] concentration equals the [OH-]
concentration.
CHEMISTRY: A Study of Matter
© 2004, GPB
11.12a