Cinclo the questions that have been assigned 1. Part A.2. A 20-ml, volume of pre

Question

Cinclo the questions that have been assigned 1. Part A.2. A 20-ml, volume of previously boiled. r titration. Explain why this volante is not critical to the analysis. deionieed water is adled to the Br 2. Part A.2. Previously boiled, ekionired water i·unavailable. In-bany M, pino·he analynra boiled) is added. How does this attempt to expedite the analysis affect the reported percent acetio high, too low, or unaffected? Explain 3. Part A.2 and B.1. The 20 ml. of water added to the Erlenmeyer flask is to be previously boiled, deionized acid in viEvegar: to0 water does absorb CO, from the atmosphere and since CO, dissolved in water causes it to be slighily acidic, W use of deionized water that has not been previously boiled cause the mass of acetic acid in the vinegar to water. Since will the be calculated as too high or too low? Explain. 4. Part A.2 a. In determining the percent acetic acid in vinegar, the mass of each vinegar sample is measured rather than the vol ume. Explain. b. If the vinegar were measured volumetrically (e.g., a pipet), what additional piece of data plete the calculations for the experiment? Part A.3. The buret is filled with the NaOH titrant and the initial volume reading is immediately recorded wit would be needed to com- waiting the recommended 10-15 seconds. However in Part B.1, the 10-15 second time lapse does occut reading is made. Does this technique error result in an increase, a decrease, or have no ef acetic acid in the vinegar? Explain. 6. Part B.1. The endpoint of the titration is overshot! Does this technique error result in an increase, a no effect on the reported percent acetic acid in the vinegar? Explain. ffect on the reported percent decrease, or have Part B. 1. The wall of the flask is periodically rinsed with the previously boiled, deionized water from the Does this titrimetric technique result in an increase, a decrease, or have no effect on the reported centacetic c the vinegar? Explain. 8. Part B.1. A drop of NaOH titrant, dispensed from the buret, adheres to the wall of the Erlenmeyer las washed into the vinegar with the wash bottle. Does this error in technique result in the reported percent of acetic being too high, too low, or unaffected? Explain. but is not 148 Vinegar Analysis 128

Explanation / Answer

The reason why you wait to take the reading and wait is because you want the liquid to fill correctly all the buret and you want the bubbles of air to come out, if you don´t wait then your initial reading might be higher than the real one and therefore you will get a higher concentration of NaOH and a higher concentration of Acetic acid

If you rinse the flask you should not get a different result for acetic acid since you are not changing the ammount of vinegar moles nor NaOH moles. The concentration of vinegar will change but if you know the ammount of moles from the solution this should not make anny difference.

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