Show methods clearly for the following questions. Label all units correctly. An

Question

Show methods clearly for the following questions. Label all units correctly. An unknown NaCl solution was made in the stockroom using 150.0 grams of NaCl and 500.0 grams of water. Do the following problems based on this solution. a) Find the % NaCl and %water by weight. b) Complete the table below by writing the percent values obtained in a). c) If you evaporated 88.840 grams of solution, how many grams of NaCl should you obtain? Solve this by factor-label method using one of the conversion factors in b).

Explanation / Answer

Since you have already solved the first two subparts correctly, I am going to skip those and directly solve the third subpart.

In case you were confused on reading the question, because I was too at first, the question is trying to ask that if you take 88.840 grams of the solution and let all the water evaporate, how many grams of NaCl salt would you be left with?

Using factor label method we need to cancel "grams of solution" and bring "grams of NaCl" in the final answer. Thus,

88.840 g solution x   150.0 g NaCl   = 20.50 grams of NaCl
650.0 g solution

This will cancel grams of solution and leave weight/grams of NaCl which is the answer. Do remember to take care of significant digits in your calculation. Even though 88.840 g has 5 significant digits, the concentration has only 4, so the final answer have only 4 significant digits.

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