Having reliable concentrations of dissolved oxygen

$25.00

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Having reliable concentrations of dissolved oxygen

 Having reliable concentrations of dissolved oxygen is critical for organisms in aquatic environments.

An aqueous solution has 0.0081 g of oxygen dissolved in 2.5 L of water. Calculate the dissolved oxygen concentration of this solution in parts per million.

(Do not show your work in the space provided; record only your final answer with the correct number of significant digits and the proper units.)

2)

Potassium chloride is used in some de-icing products designed to be safer for pets and plants.

What mass of solute, in mg, is present in a 250 mL sample of potassium chloride solution with a concentration of 8.1 ppm?

(Do not show your work in the space provided; record only your final answer with the correct number of significant digits and the proper units.)

3)

In some areas, drinking water is fluoridated to reduce tooth decay. The maximum acceptable concentration (MAC) of fluoride ions in drinking water is 1.50 ppm.

In Dublin, California, a malfunction occurred in the fluoridation equipment caused fluoride levels to rise as high as 200 ppm. This resulted in many people becoming ill.

During the malfunction, 627 kg of fluoride ions where injected into a storage tank of water. Given that the resulting concentration was 200 ppm, calculate the volume, in ML, of the water storage tank.

(Do not show your work in the space provided; record only your final answer with the correct number of significant digits and the proper units.)

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