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Sagot :
Answer:
1.
Find the mass of the solute mixed in with the solvent. The solute is the substance that you’re mixing in to form your solution. If you’re given the mass of the solute in your problem, write it down and be sure to label it with the correct units. If you need to find the mass of the solute, then weigh it on a lab scale and record the measurement.
2.
Record the total volume of the solution. The total volume of the solution is the amount of solvent plus the amount of solute added to it. If you’re finding the volume in a lab, mix the solution in a graduated cylinder or beaker and look at the measurement. Measure the volume from the curve at the top of the solution, or the meniscus, to get the most accurate reading. Record the volume of the solution.
3.
Divide the mass of the solute by the total volume of the solution. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution. Don’t forget to label to label your answer with the correct units.
4.
Multiply your answer by 100 if you want to find the percent concentration. If you’re asked to list the concentration in a percentage, take the answer you just found and multiply it by 100. Label your final answer with a percentage sign.
5.
Multiply the concentration by 1,000,000 to find the parts per million. Use the number you found for your concentration and multiply it by 1,000,000 or 106. The number will be how many parts per million the solute is. Label your final answer in ppm.
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