ncmpty graduated cylinder weighs 45.8772 g. After 20.0 ml of a liquid is added,

Question

ncmpty graduated cylinder weighs 45.8772 g. After 20.0 ml of a liquid is added, the cylinder and its comes cigh 77.7572 g. What is the density of the liqid in g/m. A 15 B 1.594 C. 3,89 D. 2.29 E. 2.293 2. What is the correct reading of the gradusted cylinder below? A. 43 ml 13?44111? C. 43.0 mL D. 44.0 ml E. 57 ml 3. After heating baking soda (NalHCO.) for a long time, what would be the leftover solid? A. Na B. NaHCO C. Na CO D. NaOH 00 nLoC water what is the resulting inolarity of solution when 2 g of NaOHisd, so?edin (formula weight of NaOH 40.) 4, A. 0.01 M B. 0.05 M C. 0.1 M D. 0.5 M E, 5.0M Which technique could be used to determine the unknown percentages of a solid mixture of NaHCO, and BaCI: 2H 0? 5. A. Chromatography B. Thermal gravimetric C. Precipitation gravimetric D. Titration 6. During the reaction of an acid with a metal, which one of the following substances could be produced? A. H2 B. CO C. O2 D. HO

Explanation / Answer

1.

Weight of liquid = 77.7572-45.8772 = 31.87 gm.

20 ml added, so 31.87 g /20 ml = 1.594

B is correct answer.

2.

C. 43.0 ml

3.

D. NaOH

4.

Molarity = Mole of solute/Litre of solution

Mole = 2 g/40 g/mol = 0.05

Molarity = 0.05/0.5 L

Molarity = 0.1

C is correct answer.

5.

B. Thermal Gravimetric

6.

A. H2

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