can someone explain the following from 3 and down thank you QUESTIONS 1. From th

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can someone explain the following from 3 and down thank you

QUESTIONS 1. From the SDS, what is another name for sodium hydroxide? 2 Why will the phenolphthalein eventually fade? Show reactions. 3. Why do we titrate into a flask instead of a beaker? 4. What effect would each of the following errors have on the determined concentration of the unknown acid? (Would the calculated value be too high, too low or unchanged?) Explain your reasoning in each case. The mass of the oxalic acid was recorded too high a. b. The unknown acid was added to a flask containing 20mL of water c. The initial volume in the standardization was recorded too low d. The initial volume in the determination of the unknown was recorded too low I TITRATION REPORT FORM

Explanation / Answer

3. Following are the few advantages of using a flask instead of a beaker.
i) Flask gives many benefits of having tapered side and narrow neck, this allows mixing of liquid uniformly.
ii) Due to its narrow neck, there is less chance of spillage during titration.
iii) Its narrow neck also helps in filtering the liquid by supporting the funnels.

4.
a) If the mass of oxalic acid is recorded too high then the total number of moles of the oxalic acid will be high and therefore calculated concentration will be also high.

b) If it is added to water, its total volume will become high and therefore concentration will be low because the concentration is inversely proportional to volume.

c) If the volume of standard solution is recorded too low then its total moles will low because molarity multiplied by volume gives moles and therefore the concentration of the unknown acid will be low.

d) If the volume is recorded too low then concentration calculated will be too high because concentration is inversely proportional to the volume of the acid, concentration = Moles/Volume.

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