Hexane, perfluorohexane and water are immiscible liquids and when placed in a graduated cylinder along with pieces of high-density polyethylene, polyvinylchloride and Teflon which are not dissolving in the given liquids, what can be seen in the cylinder has to be given. Concept Introduction: Buoyancy: It explains the floating nature of a substance in a fluid based on the densities of the substance and the fluid in which it is placed. If a substance with low density is placed in a fluid of more density, then the substance floats in that fluid. If a substance with high density is placed in a fluid of low density, then the substance sinks in that fluid.

Question

The maximum contaminant level of fluoride (F−)(F−) in drinking water as set by the the Environmental Protection Agency (EPA) is 0.0040 g⋅L−10.0040 g⋅L−1. Express this concentration in parts per million (ppm). Assume the density of water is 1.00 g/mL1.00 g/mL.

Answer 1

Question

Chapter 1, Problem 85QRT

Interpretation Introduction

Interpretation:

Hexane, perfluorohexane and water are immiscible liquids and when placed in a graduated cylinder along with pieces of high-density polyethylene, polyvinylchloride and Teflon which are not dissolving in the given liquids, what can be seen in the cylinder has to be given.

Concept Introduction:

Buoyancy:

It explains the floating nature of a substance in a fluid based on the densities of the substance and the fluid in which it is placed.

If a substance with low density is placed in a fluid of more density, then the substance floats in that fluid.

If a substance with high density is placed in a fluid of low density, then the substance sinks in that fluid.

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The maximum contaminant level of fluoride (F−)(F−) in drinking water as set by the the Environmental Protection Agency (EPA) is 0.0040 g⋅L−10.0040 g⋅L−1. Express this concentration in parts per million (ppm). Assume the density of water is 1.00 g/mL1.00 g/mL.

For the analysis of unknown soda and vinegar samples, 25.0 mL soda and 1.0 mL vinegar samples were diluted to 50.0 mL in separate Erlenmeyer flasks. KHP, 0.85 g, (Purity = 99.98%; Molar mass = 204.22 g/mol) was titrated with 11.5 mL of NaOH. After the standardization step, it required 0.0143 L of NaOH to reach the endpoint with the soda sample while it took 0.00885 L with the vinegar sample. Phenolphthalein was used as the indicator for the experiment. Express all final answers in 2 significant figures. a. Determine the concentration of the titrant (NaOH) b. Determine the concentration of the unknown vinegar sample. c. Determine the concentration of the unknown soda sample.

For the analysis of unknown soda and vinegar samples, 25.0 mL soda and 1.0 mL vinegar samples were diluted to 50.0 mL in separate Erlenmeyer flasks. KHP, 0.85 g, (Purity = 99.98%; Molar mass = 204.22 g/mol) was titrated with 11.5 mL of NaOH. After the standardization step, it required 0.0143 L of NaOH to reach the endpoint with the soda sample while it took 0.00885 L with the vinegar sample. Phenolphthalein was used as the indicator for the experiment. Express all answers in 2 significant figures. a. Determine the concentration of the titrant (NaOH) b. Determine the concentration of the unknown vinegar sample. c. Determine the concentration of the unknown soda sample.