ws-ph-scale-and-calculations

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Name: __________________________________
Date: _______________
Period: ____
WS pH Scale & Calculations
1.
A water molecule that loses a hydrogen-ion (H+) becomes a __________________ ion
with the formula _______.
2.
A water molecule that gains a hydrogen-ion (H+) becomes a __________________ ion
with the formula _______.
3.
The reaction represented below in which water molecules produce ions is called the
_________________________ of water.
4.
A(n) __________________ solution is one with more [H+] than [OH–].
A(n) __________________ solution is one with more [OH–] than [H+].
5.
6.
Match the type of solution with its hydrogen-ion concentration:
____ acidic
A. less than 1.0 x 10–7 M [H+]
____ neutral
B. greater than 1.0 x 10–7 M [H+]
____ basic
C. equal to 1.0 x 10–7 M [H+]
pH is a measure of the concentration of ________________________________ in a solution.
Mathematically, pH is the negative ____ of __________________ concentration.
OR
pH =
1
7.
8.
Match the type of solution with its pH:
____ acidic
A. pH > 7
____ neutral
B. pH = 7
____ basic
C. pH < 7
Write the following substances on the appropriate line along the pH scale that estimates the pH:
ammonia
9.
vinegar
blood
stomach juices
soap
DI water
WITHOUT a CALCULATOR, write the pH or hydrogen-ion concentration of these solutions:
[H+] in M
pH
acidic, basic, or neutral
A. 1.00 x 10–7 M
____
_________
B. 1.00 x 10–1 M
____
_________
C. _________ M
9
_________
D. _________ M
3
_________
E.
3.20 x 10–10 M
≈ ____
_________
(approximately)
For #10-11:
SHOW ALL WORK and use a Calculator
10. Calculate the pH for a solution of 2.40 x 10–10 M [H+].
11. Calculate the pH for a solution of 8.30 x 10–5 M [H+].
2
12. pOH is a measure of the concentration of ________________ in a solution.
Mathematically, pOH is the negative ____ of __________________ concentration.
OR
pOH =
13. What is the pOH of a neutral solution? _____
14. Calculate the pH for a solution of pOH = 6.
Calculate the pOH for a solution of pH = 11.5
15. Complete the table below. (You may show your work on the back, or show no work)
pH
A.
3.80
B.
2.25
pOH
C.
1.50
D.
8.14
[H+]
E.
1.26 x 10–4 M
F.
2.04 x 10–4 M
[OH–]
G.
4.57 x 10–8 M
H.
3.16 x 10–3 M
acid or base
3
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