Write a balanced equation for the titration of NaOH with: Citric acid (acid in c

Question

Write a balanced equation for the titration of NaOH with: Citric acid (acid in candy) Lactic acid (acid in milk) How would having a large air bubble in the buret tip at the start of the experiment affect the calculated value of g acid/g of sample? List 3 other substances that you can use (instead of Sweet Tarts or mil) to determine the amount of acid. Make sure that these substances contain different acid than lactic or citric acid. Substance Name of Acid Comparing whole milk, 2% milk and skim milk, which do you expect to have more acid and why?

Explanation / Answer

1 a)Sodium Hydroxide + Citric Acid --> Sodium Citrate + Water + Heat
C6H8O7 + 3NaOH --> NaC6H5O7 + 3H2O + HEAT

b) NaOH + C3H6O3 NaC3H5O3 + H2O

2) Think practically about what you are doing. Your burette is very carefully adjusted to zero ml. But there is an air bubble in the tip. You now start your titration. The first fractions of a ml are used to fill up the tip and displace the air. The level in the burette will have dropped below zero, and may read 0.3ml. But so far nothing has actually been delivered into the erlenmeyer flask. Only after the tip has been filled and all the air expelled, will addition to the flask begin. So your reading on the burette will be of larger volume than was actually dispensed into the erlenmeyer flask. To answer your question: the reported volume of titrant will be too high.

3)A

1 a)Sodium Hydroxide + Citric Acid --> Sodium Citrate + Water + Heat
C6H8O7 + 3NaOH --> NaC6H5O7 + 3H2O + HEAT

b) NaOH + C3H6O3 NaC3H5O3 + H2O

2) Think practically about what you are doing. Your burette is very carefully adjusted to zero ml. But there is an air bubble in the tip. You now start your titration. The first fractions of a ml are used to fill up the tip and displace the air. The level in the burette will have dropped below zero, and may read 0.3ml. But so far nothing has actually been delivered into the erlenmeyer flask. Only after the tip has been filled and all the air expelled, will addition to the flask begin. So your reading on the burette will be of larger volume than was actually dispensed into the erlenmeyer flask. To answer your question: the reported volume of titrant will be too high.

3)A

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