Laboratory Mathematics - US Army Subcourse

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Upon standing, the oil droplets (dispersed phase) will tend to coalesce, forming larger and larger droplets. These droplets eventually become too large to remain within the dispersion medium (water) and the two liquids will separate. If one wishes to stabilize an emulsion, an emulsifying agent such as a bile salt must be added. 2-24. SATURATED SOLUTIONS The laboratory specialist may on occasion be required to prepare a saturated solution. This type of solution is defined as a solution in which the dissolved solute is in equilibrium with undissolved solute.

2-28. SOLVING WEIGHT/VOLUME PROBLEMS The first step in solving any solution problem is to carefully read the problem. Remember that a unit of concentration consists of two components-- a weight (or volume) and a volume, thus w/v or v/v. Also notice that in reading the problem, the wording will suggest that a solution is to be prepared. Words such as "prepare" or "make" will be used in this type of problem. When making a percent solution, three things are necessary, that is, mass of solute needed, concentration of the solution to be prepared, and total volume of solution.

Ratio and proportion is well suited for solving this type of problem. Set the problem up with respect to the considerations discussed in Appendix A concerning ratio and proportion. 5 mg ———— = ———— 1 dL x dL Solve for the unknown quantity. 5 mg To completely satisfy the problem, convert deciliters to milliliters. 00 dL X ———— = 500 mL 1 dL c. Example 3. 0 mL flask and adjusting the volume to the mark? Solution. Read the problem carefully and determine what the problem is asking for. Percent (Solving this type of problem involves expressing the mass of solute per unit volume.

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