Name: ______Pretest: _____ /41
Posttest: _____ /41
Pretest Ch 8: Acids and Bases
Match the term on the right with the definition on the left.
1. ______forms hydronium ions when added to waterA. acid
B. base
2. ______process of gradually adding one solution to C. dissociate
another in the presence of anindicator D. electrolyte
to determine the concentrationE. hydronium ion
3. ______OH-F. hydroxide ion
G. indicator
4. ______when a substance forms few ions in waterH. ionize
I. neutralization
5. ______results from the combination of a positiveJ. pH
ion from a base and a negative ionfrom K. salt
an acid in a neutralization reactionL. strong acid/base
6. ______chemical reaction where an acid plus a M. titration
base yields a salt and waterN. weak acid/base
7. ______forms hydroxide ions when added to water
8. ______used to express how acidic or basic (alkaline) a substance is
9. ______this means “to form ions”and refers to what strong acids do when placed in
water.
10. ______H3O+
11. ______forms many ions in water
12. ______a substance that changes color with changes in pH (ex: phenolphthalein,
cabbagejuice)
13. ______a substance that conducts electricity when dissolved in water
14. ______this means “to break apart” and refers to what strong bases do when
placed in water.
15. Give 2 examples of things you can find at home that are acids.
16. Give 2 examples of things you can find at home that are bases.
17. Which is more damaging, an acid or a base? Explain.
18. – 21. Identify each of the following as an acid or base.
HClNaOH
H3PO4H2CO3
KOHH2SO4
Ca(OH)2HNO3
22. – 23. Something has pH of 4. What color will it be if I put phenolphthalein in it?
Whatif I put bromothymol blue in it?
Here are the pHs of three substances:
A pH=9B pH = 4C pH= 12
24. Which is most acidic?
25. Which is most basic?
26. What does it mean to be “more acidic” or “more basic” ?
27. How many times more powerful is C than A?Explain.
28. What is an electrolyte? Are acids and bases good ones or not? Explain.
29. Correctly write the equation for the neutralization of phosphoric acid (H3PO4) by
sodium hydroxide (NaOH).
30. When a solution of acid reacts with a solution of a base, hydronium ions from the
acid reactwithhydroxide ions from the base to form…
31. When a solution of acid reacts with a solution of a base, the cations from the
base react with theanions from the acid to form…
Name the salts formed by these reactions (I’m not asking you to balance them, but
you should be able to ):
32. HCl + NaOH ______
33. H2SO4 + Ca(OH)2 ______
34. H3PO4 + 3 KOH ______
Below is a graph of a process called titration. Use it to answer the following questions.
35. The solution starts as an acid/base (circle one). Explain.
36.The solution ends up as an acid/base (circle one). Explain.
37. Acid/base (circle one) was added to the solution. Explain.
38. As NaOH is added by letter A, the number of H3O+ ions increases/decreases/is
unaffected (circle one). Explain.
39. As NaOH is added by letter A, the number of OH- ions increases/decreases/is
unaffected (circle one). Explain.
40. As NaOH is added by letter B, the number of H3O+ ions increases/decreases/is
unaffected (circle one). Explain.
41. As NaOH is added by letter B, the number of OH- ions increases/decreases/is
unaffected (circle one). Explain.