Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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- A 0.7500-g sample of pure KHP (Fwt=204.2g/mol) was dissolved and titrated with 35.0 mL of NaOH. The end point was overstepped and it was necessary to backtitrate with 3.50 mL HCl. Calculate the molarity of NaOH and HCl if the ratio is 30.0 mL NaOH to 25.0 mL HCl.
- Approximately 6 mL of conc.perchloric acid ( 72% ) was transferred to a bottle and diluted with about 1 liter of water. A sample containing 251.5 mg of primary standard Na2B4O7.10H2O required 27.41 mL of the HClO4 solution to reach the methyl red end point. What is the molar concentration of the HClO4 solution? (Fwt.= 382g/mol)
Na2B4O7.10H2O + HClO4 ------------> NaClO4 H2B4O7.10H2O
- A 1.900-g sample is analyzed for benzoic acid content. The sample was dissolved and diluted to the mark using a 500-mL volumetric flask. A 30.0mL aliquot required 5.00mL of 0.1575M NaOH solution. Calculate the %(w/w) benzoic acid (Fwt=122) in the sample.
C6H5COOH + NaOH -------------> C6H5COONa + HOH
- In one experiment, 0.0995M HCl was used to analyze soda ash and the following data were obtained:
|
Mass of Na2CO3 |
0.2980 g |
|
Initial reading of HCl |
0.20mL |
|
Final reading of HCl |
20.00mL |
What is the net volume in liters of HCl used?
How many moles of Na2CO3 was used in the analysis?
What is the corresponding Normality of the HCl used?
What is the percent Na2CO3 in the soda ash sample?
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