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s2008m [1.1K]
3 years ago
12

Is this the correct procedure for cleaning volumetric glassware prior to making a measurement: first, rinse with tap water. Seco

nd, rinse with deionized water from your wash bottle. Finally, rinse once (or preferably twice) with the solution you are going to be measuring. Dispose of these rinses in your waste beaker?
Chemistry
2 answers:
Bogdan [553]3 years ago
6 0

The steps to be followed while cleaning volumetric glassware are:

1. Remnants from the previous measurements are wiped off with the help of paper towel.

2. The glassware is then soaked overnight in warm soap solution.

3. Then before rinsing with tap water, the glassware are scrubbed with an appropriate brush.

4. After scrubbing, the glassware is rinsed thoroughly with tap water in order to make sure there are no traces of soap solution.

5. The glassware is then rinsed with de-ionized water and finally with the solution that would be used for the volumetric measurement.

irina [24]3 years ago
5 0

Answer:

True.

Explanation:

Hello,

In this case, the first step allows us to dissolve and remove primary residues such as solids or other unsoluble liquids. Next, the deionized water allows us to remove traces of ionized chemical species such as cations or anions. Finally, such rinsing is useful to adapt the volumetric glassware for the experiment to assure no previous substances to be present.

In addition, the residues of those rinses should be disposed on a waste beaker for further treatment or storage.

Best regards.

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0.0250 g

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Step 1: Determine the molar mass of Vitamin C.

The molar mass is the mass in grams corresponding to 1 mole. In order to calculate the molar mass of vitamin C (C₆H₈O₆) we need to add the molar masses of the elements that compose it.

M(C₆H₈O₆) = 6 × M(C) + 8 × M(H) + 6 × M(O)

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M(C₆H₈O₆) =  176.14 g/mol

Step 2: Calculate the mass corresponding to 0.000142 mol of vitamin C.

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