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Embed code for: CH5007 Tutorial 1 (1)
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Tutorial 1 – Calculations and Concentration
An aqueous solution has a concentration of 1.43 x 10-6 mol dm-3 in sodium ions (Na+). Convert this value to give the concentration of sodium ions in ppm and also in ppb?
An aqueous solution was prepared by dissolving 0.3324 g of phenol in 10 L of water. Calculate the concentration of the phenol in this solution in units of:
The Mr of phenol is 94 g mol-1
If a solution has a concentration of iron given as 2.53 ng cm-3. What is the concentration of iron in ppb, µg mL-1 and mg L-1.
A sample of fingernail weighing 0.1034 g is found to contain 53.17 µg of lead. What is the concentration of lead in the fingernail?
A sample of hair weighing 0.0546 g is digested to form 100 cm3 of an aqueous solution which was found to have a concentration of 55 ppm in cadmium. What is the concentration of cadmium in the hair?
A solution of benzene in water has a concentration of 4.55 ppm. A 5 ml sample of this is diluted to 100 ml what is the concentration of benzene in the diluted solution?
An aqueous solution contains paracetamol. A 10 cm3 portion of the solution was diluted to 50 cm3 with water. The diluted solution was found to contain 52.1 ppb of paracetamol. What was the concentration of paracetamol in the initial solution? You are asked for the concentration in µg mL-1. Can you make the conversion?
A sample of soil was extracted with acid to remove all the copper. The soil sample weighed 1.2293 g and the extraction solution containing the copper was diluted to a volume of 50 cm3. A sample of the extraction solution (5 cm3) was removed and diluted to 100 cm3 to form a new solution labelled the test solution. This solution was found to contain copper at a concentration of 81.4 ppm. What is the concentration of copper in the soil?