In each case, the percentage concentration is calculated as the fraction of the weight of the solute related to the total weight or volume of the solution. Because percent solutions can be expressed in three different ways, it is imperative that the type of percent solution be explicitly stated.
2 is dissolved in 90.00g of water. The density of the solution is 1.09g/mL. Calculate the weight/volume percentage concentration of the solution. 1. 2.0L of an aqueous solution of potassium chloride contains 45.0g of KCl. 1 weight/volume percentage concentration is usually abbreviated as w/v 2  (%). w/v (%) = mass solute &divide volume solution x 100. 3  common units are g/100mL 4  (%). weight/volume is a useful concentration measure when dispensing reagents. Percent solutions can take the form of weight/volume % (wt/vol % or w/v %), weight/weight % (wt/wt % or w/w %), or volume/volume % (vol/vol % or v/v %). In each case, the percentage concentration is calculated as the fraction of the weight or volume of the solute related to the total weight or volume of the solution. Because percent solutions can be expressed in three different ways, it is imperative that the type of percent solution be explicitly stated. If this information is not provided, the end user is left to guess whether w/v %, w/w %, or v/v % was used. For example, a 70 % (v/v) solution of ethanol can be prepared by dissolving 70 mL of 100% (i.e., 200 proof) ethanol in a total solution volume of 100 mL. Other factors may also be important when deciding on the type of percent solution to prepare. Concentration: Weight/Weight % This concentration unit is similar to ppm or ppb except it focuses on the solute as a percent (by mass) of the total solution. It is appropriate for realtively large solute concentrations. by definition we have As an example consider 5 g sugar dissolved in 20 g of water.  In thermodynamics, the specific volume of a substance is the ratio of the substance's volume to its mass. It is the reciprocal of density and an intrinsic property of matter as well. Specific volume is defined as the number of cubic meters occupied by one kilogram of a particular substance.  Divide the object's mass by its volume. This value is the object's density and expresses it in units of mass per unit of volume. For example, for a 20-gram mass that takes up a volume of 5 cubic centimeters, the density is 4 grams per cubic centimeter. Ad. 1 If the object is a liquid or powder, place it in a graduated cylinder and read the mark to which the substance fills the container. ( 2 If the substance is a liquid, read the mark at the lowest point of the curve the top of the liquid forms.). 3  3 Edit step. For liquid fertilizers, you need to know the density of the solution, as the nutrient concentration is based on the weight and not the volume. Liquid fertil-izers such as 30-0-0 (urea ammonium nitrate or UAN), are often used as starter fertilizers or for sidedressing corn.  Density of liquids usually is expressed in units of g/ml. If you know the density of a liquid and the volume of the liquid, you can calculate its mass. Similarly, if you know the mass and volume of a liquid, you can calculate its density. Example Problem : Calculate the mass of 30.0 ml of methanol, given the density of methanol is 0.790 g/ml. mass = volume x density. mass = 30 ml x 0.790 g/ml. mass = 23.7 g. In real life, you can usually look up the density of commons liquids in reference books or online. Percentage solution is an ambiguous term which is used to describe a solution with the unit  % . It may refer to: 1  Mass fraction (chemistry) if % mass/mass (% w/w) is meant. 2  Also known as wt.%. It may refer to: 1  Mass fraction (chemistry) if % mass/mass (% w/w) is meant. 2  Mass concentration (chemistry) if mass/volume multiplied by 100 (improperly written % w/v) is meant (see also usage in biology). 3  Volume concentration if % volume/volume (% v/v 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. For example, a 70 % (v/v) solution of ethanol can be prepared by dissolving 70 mL of 100% (i.e., 200 proof) ethanol in a total solution volume of 100 mL. Other factors may also be important when deciding on the type of percent solution to prepare. 1 Weight/Volume Percentage is a measure of the concentration of a solution. 2  weight/volume percentage concentration is usually abbreviated as w/v 3  (%). w/v (%) = mass solute &divide volume solution x 100. 4  common units are g/100mL 5  (%). weight/volume is a useful concentration measure when dispensing reagents. 1 weight/volume percentage concentration is usually abbreviated as w/v 2  (%). w/v (%) = mass solute &divide volume solution x 100. 3  common units are g/100mL 4
http://www.ausetute.com.au/wtvol.html http://www.physiologyweb.com/calculators/percent_solutions_calculator.html http://www.iun.edu/~cpanhd/C101webnotes/aqueoussolns/wwpcnt.html https://en.wikipedia.org/wiki/Specific_volume http://www.wikihow.com/Find-Density http://pubs.ext.vt.edu/424/424-035/424-035_pdf.pdf http://chemistry.about.com/od/chemistryquickreview/a/liquidmass.htm https://en.wikipedia.org/wiki/Percentage_solution http://www.physiologyweb.com/calculators/percent_solutions_calculator.html http://www.ausetute.com.au/wtvol.html
how to calculate %w/w of a liquid