Two liters of water was found to contain 6 mg of benzene(C_6H_6). What is the co

Question

Two liters of water was found to contain 6 mg of benzene(C_6H_6). What is the concentration of benzene in: a. ____ mg/L b. ____ ppm c. ____ molarity A mass of 0.525 g of sodium chloride (NaCI) has been added to a cylinder containing water. The cylinder diameter is 4 cm and the depth of the water in the container is 5 inches. Determine the concentration of the sodium in solution showing your answer in units as shown below. (use 1 in = 2.54 cm, if needed, Atomic weights of Na = 23 and CI = 35): a. mg/L ____ b. Mass% ____ c. molarity ____ State whether true or false. i. 10 mg/L is considered to be equivalent to 10 ppm in mass units. ii. A sample taken from a homogeneous mixture will exactly represent the concentration of the mixture from which the sample is taken. iii. Acidic solutions have generally a pH value less than 7 iv. Iron can combine with sulfur to form iron sulfide. v. The accuracy of any measurement is an impression of how close it is to the correct result. Precision is how close the measurement is to the average of all measurement. Precise measurement does not necessarily mean it is accurate. vi. Significant figure of 1.0030 is five. vii. Natural alkalinity helps in maintaining the waters to a habitable pH levels. viii. Molarity and normality are related expressions of concentration of solution. ix. Molarity and normality are related expressions of concentration of solution. x. Hydronium is an ion and have electric charge.

Explanation / Answer

Q1.

5 mg n 2 liters...

a)

C = mass/V = 5 mg/ 2L = 2.5 mg/L

b)

ppm = mg/L --> 2.5 ppm

c)

Molaity = mol/V = (mass/MW) / (2L) = (5*10^-)/78.11 /(2) = 0.0000320

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