question number 8 Belridigm shift (c) buoyancy distortion (d) the chevron angle

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question number 8

Belridigm shift (c) buoyancy distortion (d) the chevron angle paralax 6. What should you not do with a transfer pipette? (a) transfer alcohols (b) blow the last drop out when emptying (c) suck up liquids with your mouth @ (b) and (c) (e) (a), (b) and (c) ftayous magnesium perchlorate, barium oxide, alumina, phosphorus pentoxide, calcium sulfate and silica gel have this in common ey are all desiccants (b) they are all white powders (c) they are all components of sand (d) they are all insoluble in water (e) none of the above a gravimetric analysis you mistakenly forget to dry the filter crucibles before collecting recipitate. After filtering the product, you dry the product and crucible and weigh them together Is the error in the mass of product that you report systematic or random? Is it always h always low? (Two answers separated by comma) (a) systematic, low (b) systematic, high (c) random, low (d) random, high (e) None of the above After filtering the produc 9. When using a pipet you should (a) grasp the pipet in your fist and use your thumb to control the level (b) grasp the pipet with your fingers and use your index finger to control the leve (c) use a pipet bulb (d) (a) and (c) b) and (c) 10. When making a 250.00 mL of 100.00 ppm Cu stock solution from Cuso (a) weigh the CuSO, on a top loading balance; dissolve the CusO, and dilute to the mark in (b) weigh the CuSOs on an analytical balance, dissolve the CuSO, and dilute to the mark in @weigh the CuSO, on an analytical balance, dissolve the CuSO, and dilute to the mark i (d) weigh the CuSO, on a top loading balance, dissolve the CuSO, and dilute to the mark 250 mL Erlenmeyer flask 250 mL Erlenmeyer flask 250 mL volumetric flask 250 mL volumetric flask

Explanation / Answer

Apparent mass of product is systemitcally low because the initial mass of the product(crucible plus moisture) is higher than the true mass of the crucible. The error is systematic.

Its easy to think because the error is not random, it happened because of a fault in the system. A person mistakenly forgot to dry the precipitate therefore the system gets distorted and their will be an error in the mass calculation.

The apparent mass will be low because earlier calculated mass was high due to the error .

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