4. A chemist wants to determine the concentration of an acidic solution. They start by placing 25.0 mL of the acid in a flask. Then, they titrate it with 7.5 mL of 0.12 M NaOH. a. How many moles of NaOH were added to the acid? b. Assuming the acid and base react in a 1:1 ratio, how many moles of acid are in the flask? c. What is the molarity of the unknown acid?

Chemistry: An Atoms First Approach
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Chapter6: Types Of Chemical Reactions And Solution Stoichiometry
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Problem 80E: The concentration of a certain sodium hydroxide solution was determined by using the solution to...
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4. A chemist wants to determine the concentration of an acidic solution. They start by placing 25.0 mL of
the acid in a flask. Then, they titrate it with 7.5 mL of 0.12 M NaOH.
a. How many moles of NAOH were added to the acid?
b. Assuming the acid and base react in a 1:1 ratio, how many moles of acid are in the flask?
c. What is the molarity of the unknown acid?
Titration Curve
13
12
5. Use the titration curve to the right to answer the following questions
11
10
9.
8
A. What is the pH at the equivalence point?
pH 7
6.
5
4
B. Is the unknown acid or base? Weak or strong? How can you tell?
3
2
1
0 5 10 15 20 25 30 35 40 45 50 55 60
Amount of Base added (mL)
C. What is the Ka of this unknown solution?
Transcribed Image Text:4. A chemist wants to determine the concentration of an acidic solution. They start by placing 25.0 mL of the acid in a flask. Then, they titrate it with 7.5 mL of 0.12 M NaOH. a. How many moles of NAOH were added to the acid? b. Assuming the acid and base react in a 1:1 ratio, how many moles of acid are in the flask? c. What is the molarity of the unknown acid? Titration Curve 13 12 5. Use the titration curve to the right to answer the following questions 11 10 9. 8 A. What is the pH at the equivalence point? pH 7 6. 5 4 B. Is the unknown acid or base? Weak or strong? How can you tell? 3 2 1 0 5 10 15 20 25 30 35 40 45 50 55 60 Amount of Base added (mL) C. What is the Ka of this unknown solution?
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