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Nt1310 Unit 6 Lab

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Student Name: Andreas Sippl
Student ID: 4445491
Date: 04 January 4, 2015
Course and Section Number: SCIN131

Lesson 6 Lab: Titrations and Natural Acid/Base Indicators

Begin by viewing the following Thinkwell videos

15.1.7 CIA Demonstration: Titrations
11.2.2 CIA Demonstration: Natural Acid-Base Indicators

(NOTE: The second video is sort of a supplement to the first, and shows how this applies to your daily life. Feel free to try some of the things listed in the video, but be sure to report back to the class regarding the results of your experiments!)

After you watch the above video, answer the questions below in sufficient detail:

(a) (1 pts.) In YOUR OWN WORDS, what is a titration? What type of reaction is it? Be detailed and specific …show more content…
Titration is a neutralization reaction.

(b) (1 pts.) What is the BALANCED chemical reaction for the titration performed in this lab demonstration? What does this balanced equation tell us that is so important with respect to this particular lab exercise, and how do you mathematically use this information in this lab?

Answer: The balanced chemical reaction for the titration performed in this lab demonstration is: NaCOOH (aq) + NaOH (aq)=Na (CH3COO) (aq)+H2O (l). A basic solution has positive ions and OH- ions like Na+ and OH-. Acid solutions have H3O+ and negative ions like CH3COOH + H20 -> H3O+ + CH3COO-. When basic and acid mix, positive and negative ions will bond: Na+ + CH3COO- -> CH3COO-Na+ (aq) and the H3O+ and OH- will also bond.

(c) (1 pts.) What is the name of the special piece of glassware used in this titration exercise? Why use it as opposed to, say, a graduated pipette--what is special about the glassware used here? How is it SPECIFICALLY used in this lab?

Answer: The name of the special glassware is burette, because it is a long, thin tube, it allows a precise measurement of liquid. In this lab the burette is used to measure the amount of sodium …show more content…
How do you then use this information to determine the concentration of the acid? Explain in detail, showing all work.

Answer: Because acetic acid and NaOH react in a 1:1 ratio, the moles of acetic acid and the moles of NaOH are the same. Therefore the number of moles have to be devided by the volume of the vinegar, and this will give you the concentration of the acetic acid in the vinegar, which is 0.89 M CH3COOH.
M = 0.01778 mol * 1/20mL * 1000mL/1L m = 0.89 mol/L m = 0.89 M CH3COOH

(f) (1 pts.) In this titration example, how do you know when the reaction is complete? What is used (be specific), and how does it work? What is the official name (Dr. Yee mentions this) of the end of this reaction? Be sure to address all questions to receive credit.

Answer: In this lab you know that the reaction is complete once the liquid turns pink. You use a base like NaOH to neutralize the acid. Phenolphthalein is the indicator. The official name of the end of this reaction is called the “end point”. Dr. Yee continues to add drops of phenolphthalein to the liquid until it turns pink and then you swirl the liquid around. If the color goes away, you continue to add the drops until the liquid stays a light pink

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