10. A 0.514 gram sample of NażCO, (106.0 g/mol) was dissolved in distilled water in a 100.0 mi. volumetric flask. The molar concentration of Na,CO, in solution is: 0.0485 M 0.0370 M 0.4849 M 0.0340 M 0.0330 M b. P. e.

Chemistry: Matter and Change
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Chapter17: Chemical Equilibrium
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Problem 47A
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10. A 0.514 gram sample of NazCO, (106.0 g/mol) was dissolved in distilled water in a 100.0 mi
volumetric flask. The molar concentration of Na,CO, in solution is:
0.0485 M
0.0370 M
b.
0.4849 M
0.0340 M
0.0330 M
d.
е.
Transcribed Image Text:10. A 0.514 gram sample of NazCO, (106.0 g/mol) was dissolved in distilled water in a 100.0 mi volumetric flask. The molar concentration of Na,CO, in solution is: 0.0485 M 0.0370 M b. 0.4849 M 0.0340 M 0.0330 M d. е.
9. If an unknown sample of H,PO4 was titrated with 015. M standard solution of NaOH usme
phenolphthalein as an indicator and 10.02 mL of NaOH was nerded. Calculate the mass in (grams/ ka
H.PO, in this sample. (Molar mass of H3PO, 98.0 g/mol)
%3D
a. 0.010 g
b. 0.150 g
0.074 g
d. 0.040 g
e. 0.049 g
Transcribed Image Text:9. If an unknown sample of H,PO4 was titrated with 015. M standard solution of NaOH usme phenolphthalein as an indicator and 10.02 mL of NaOH was nerded. Calculate the mass in (grams/ ka H.PO, in this sample. (Molar mass of H3PO, 98.0 g/mol) %3D a. 0.010 g b. 0.150 g 0.074 g d. 0.040 g e. 0.049 g
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