The concentration of mercury in the given sample of well water is to be calculated and the water sample is safe or unsafe for human consumption is to be predicted. Concept Introduction: Water gets polluted due to the presence of various biological and chemical contaminants. Biological contaminants include microorganisms such as Giardia, Legionella while chemical contaminants are mercury, lead, benzene, trichloroethylene etc. Both these render water unfit for consumption by human beings and animals, if the contaminant exceeds a certain limit, termed as Maximum Contaminant Limit. The concentration of a contaminant is reported as the mass of contaminant (in milligrams) present in one liter of water. It is known that 1000 mL = 1 L , hence conversion factor of mm to L is as: 1000 mL 1 L Concentration of solute = Mass of solute Volume of solution

Question

" is The structure of the bicarbonate (hydrogen carbonate) ion, HCO3-, HCO3 best described as a hybrid of several contributing resonance forms, two of which are shown here. HO :0: :Ö: HO + Bicarbonate is crucial for the control of body pH (for example, blood pH: 7.4). A more self-indulgent use is in baking soda, where it serves as a source of CO2 CO₂ 2 gas, which gives bread and pastry their fluffy constituency. (i) Draw at least one additional resonance form. = (ii) Using curved "electron-pushing" arrows, show how these Lewis structures may be interconverted by movement of electron pairs. (iii) Determine which form or forms will be the major contributor(s) to the real structure of bicarbonate, explaining your answer on the basis of the criteria in Section 1-5.

Answer 1

Question

Chapter 12, Problem 47E

Interpretation Introduction

Interpretation:

The concentration of mercury in the given sample of well water is to be calculated and the water sample is safe or unsafe for human consumption is to be predicted.

Concept Introduction:

Water gets polluted due to the presence of various biological and chemical contaminants. Biological contaminants include microorganisms such as Giardia, Legionella while chemical contaminants are mercury, lead, benzene, trichloroethylene etc. Both these render water unfit for consumption by human beings and animals, if the contaminant exceeds a certain limit, termed as Maximum Contaminant Limit.

The concentration of a contaminant is reported as the mass of contaminant (in milligrams) present in one liter of water.

It is known that 1000 mL = 1 L, hence conversion factor of mm to L is as:

1000 mL1 L

Concentration of solute = Mass of soluteVolume of solution

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