Complete the following passage with the best answers. Some…
Complete the following passage with the best answers. Some answers may be used more than once, some may not be used. There are many ways to express the concentration of a solution, which can often lead to confusion and errors in calculation if their definitions are not understood or improperly applied. There are three common methods of expressing concentration in terms of percent. 1)______________________ expresses concentration in terms of mass of solute per mass of solution. 2)____________________ expresses concentration in terms of volume of solute per volume of solution. 3)_______________________ expresses concentration in terms of mass of solute per volume, and this way of expressing concentration in particular often leads to confusion and improper calculation. Very dilute solutions are often expressed with a different convention that borrows from the conventions using percent. 4)____________________ expresses concentrations in terms of mass of solute per mass of solution — or sometimes in terms of volume of solution — times 106. Likewise, 5)____________________ expresses concentrations in terms of mass of solute per mass of solution — or sometimes in terms of volume of solution — times 109. Sometimes they are expressed with the shorthand “milligrams per kilogram” or “micrograms per kilogram”, respectively. Care should be taken with these definitions, especially whether they are made in terms of mass or volume and even more expecially when the solvent is not water. Another important and frequently encountered method for expressing concentration is in terms of moles of solute per liter of solution, which is known as 6)___________________. This term is most commonly encountered in the chemical laboratory.