RandomQuiz v2.2 (revision date 02/05/2008) Laboratory Mathematics - General Proficiency

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1. You are performing a serial two-fold dilution utilizing 0.8ml of serum and 12 tubes each containing 0.8ml of saline. What is the dilution of serum in tube #4?: 1/64; 1/128; 1/32; 1/16

2. How many ml of 6N HCl are required to make 2.5 liters of 0.5N acid?: 833.3; 104.15; 416.6; 208.3

3. Round off each of the numbers listed to the nearest tenth. 0.094 624.759 2.25 4.759: 0.1, 624.7, 2.2, 4.8; 0.1, 624.8, 2.2, 4.8; 0.1, 624.8, 2.3, 4.7; 0.1, 624.8, 2.3, 4.8

4. How much diluent is required to prepare a 1 to 25 dilution of cerebral spinal fluid (CSF) when only 0.4ml of fluid is available?: 24.6; 40.0; 9.6; 3.6

5. Indicate the number of significant figures present in each of the following numbers: 1.040 100.001 428 386.402: 4, 6, 3, 6; 1, 1, 3, 4; 3, 6, 3, 6; 2, 3, 3, 6

6. Convert 118C to Fahrenheit.: 244.4; 212.0; 47.4; 98.6

7. How many ml of HCl (MW=36.5; SG=1.19g/ml; % assay=37) are needed to prepare 1.5 liters of 0.8M acid?: 99.55; 43.8; 19.3; 66.36

8. Express a 4N solution of Mg(OH)2 [MW=58.32] as a percent solution.: 11.7; 23.4; 46.8; 1.2

9. Indicate the number of significant figures present in each of the following numbers: 0.040 386.402 30 402: 4, 4, 2, 2; 2, 6, 2, 3; 3, 6, 1, 3; 4, 6, 1, 3

10. How many ml of H2SO4 (MW=98; SG=1.84g/ml; % assay=96) are needed to prepare 1.5 liters of 0.25N acid?: 10.4; 27.7; 20.8; 17.6

11. Calculate the following using the rules of retention for significant figures: 1.0135 + 21.315 + 1.12483 = _______________: 23.45; 23.0; 23.454; 23.5

12. Calculate the following using the rules of retention for significant figures: 0.0025 x 4.20 = ____________.: 0.010; 0.0126; 0.008; 0.0105

13. 3.17 grams of NaCl(MW=58.44) are added to 25 ml of water. What is the molarity of this solution?: 2.17; 0.87; 18.43; 4.6

14. To make 200 ml of 70 percent alcohol from 95 per cent alcohol how much 95% alcohol is needed?: 150.0; 133.0; 140.5; 147.4

15. 25 grams of Al(OH)3(MW=78) are added to 2.25 liters of water. What is the molarity of this solution?: 0.72; 1.39; 7.02; 0.14

16. You must prepare a 1 to 15 dilution for an analysis using 0.2ml of urine. What amount of diluent do you need?: 9.8; 2.8; 3.0; 14.8

17. Calculate the number of grams of solute required for the preparation of 1.5 liters of 0.32M NaHCO3 (MW=84.01).: 40.32; 26.88; 38.4; 126.01

18. How many ml of NH4OH (MW=35.05; SG=0.9; % assay=28) are needed to prepare 3.25 liters of 4 M base?: 410.09; 455.6; 127.6; 1808.1

19. How many ml of H2SO4 (MW=98, SG=1.84g/ml, % assay=96) are needed to prepare 200ml of a 3N solution?: 58.8; 29.4; 16.4; 33.3

20. How many ml of 95% ethanol are required to make 250 ml of 70% ethanol?: 92.1; 184.2; 276.3; 375.9

21. How many ml of sulfuric acid (MW=98.08; SG=1.84g/ml; % assay=96) are needed to prepare 750 ml of 0.75 M acid?: 52.96; 55.17; 101.51; 31.17

22. What is the molarity of a solution in which 125 ml of sulfuric acid (MW=98.08; SG=1.84g/ml; % assay=96) are added to water to give a final volume of 1.5 liters?: 0.016; 0.037; 0.15; 1.5

23. You are to perform a serial two-fold dilution utilizing 0.4ml of serum and ten tubes each containing 0.4ml of saline. What is the dilution of serum in tube #8?: 1/128; 1/8; 1/256; 1/16

24. Round off each of the numbers listed to the nearest tenth. 0.094 283.731, 428.45, 4.859: 0.1, 283.8, 428.4, 4.8; 0.1, 283.7, 428.4, 4.9; 0.09, 283.8, 428.5, 4.9; 0.09, 283.7, 428.5, 4.9

25. How many ml of sulfuric acid (MW=98.08; SG=1.84g/ml; % assay=96) are needed to prepare 750 ml of 0.75 M acid?: 31.17; 52.96; 101.51; 55.17

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