Name GSI Pre-lab Questions Write the answers to the questions below and be prepa

Question

Name GSI Pre-lab Questions Write the answers to the questions below and be prepared to discuss with your classmates 1. A student pipets 5.00 mL of a 5.103M NaOl solution inte a 250.00 mL volumetric flask and lutes up the mark with distilled water. What is the final molarity of the dilute solutice? 2How many liters (L) of a 0.1154 M NaOH solution are required to neutralize 0.1136moles of acid? acid? 3. What color is thymol blue indicator when the first endpoint of the titration of Na 00 with HCI is reached? 4 In one sentence define accuracy and precision in your own words 10

Explanation / Answer

1. Just use these expression:

[M] = Mo * (Vi/Vf)

M = 5.103 * (5/250) = 0.1021 M

2. Assuming it's a monoprotic acid:

moles A = moles B and moles = M * V so:

Moles A = MbVb

Vb = moles A / Mb

Vb = 0.1136 moles / 0.1154 mol/L

Vb = 0.984 L or 984 mL

3. According to differents sources, the color change goes from Red to Yellow.

4. Accuracy: Extent of a measurement matching the standard value of measurement.

Precision: Frequency of matches of a measurement.

Hope this helps.

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