Comment
Author: Admin | 2025-04-28
Different temperatures, then it is better to prepare the solution as a weight/weight % solution because its concentration would be independent of variations in ambient temperature. An important note is in order. Here, we have used "weight" instead of "mass" simply to be consistent with tradition and popular use. Thus, weight/volume % solutions should be correctly referred to as mass/volume %. Similarly, weight/weight % solutions should be referred to as mass/mass %, or simply mass %. Percent solution equations As noted above, weight refers to mass (i.e., measured on a balance). When examining the equation for each of the percent solutions above, it is very important to note that in all cases the denominator refers to the solution mass or volume and not just the solvent mass or volume. Thus, solution mass is the combined mass of solute and solvent, and solution volume is the combined volume of solute and solvent. A final note is necessary when considering volume/volume % solutions. When different volumes of an identical solution are added together, the final volume will always be exactly the sum of the individual portions added. For example, adding 50 mL of water to 50 mL of water will result in a total volume of 100 mL, and adding 75 mL of 100% ethanol to 75 mL of 100% ethanol will result in a total volume of 150 mL. However, when mixing miscible liquids (such as water and ethanol), the final volume of solution is not exactly equal to the sum of the individual volumes. For example, adding 50 mL of ethanol to 50 mL of water will result in a total volume that is less than 100 mL. It is actually closer to 96 mL. Therefore, when preparing volume/volume percent solutions, it is always better to dissolve the solute in solvent and then add additional solvent to bring the total solution volume to the desired final value. Percent Solution Calculator Each calculator cell shown below corresponds to a term in the formula presented above. Enter appropriate values in all cells except the one you wish to calculate. Therefore, at least
Add Comment