Ksp which is more soluble

In this section, we discuss the main factors that affect the value of the solubility constant. Temperature Most solutes become more soluble in a liquid as the temperature is increased. Pressure Pressure can also affect solubility, but only for gases that are in liquids.

Molecular Size Generally, solutes with smaller molecules are more soluble than ones with molecules particles. What's Next? Have friends who also need help with test prep? Share this article! Christine Sarikas. About the Author. Search the Blog Search. Find Out How. The solubility of a substance refers to the amount of solid that dissolves to form a saturated solution. Usually the units for solubility are in grams per liter.

Molar solubility refers to the number of moles of the solid that dissolve to form one litter of the saturated solution. And therefore the units would be moles per one liter or you could just write M. Ksp values can be used to predict the relative solubilities of salts that produce the same number of ions in solution. For example, silver chloride, silver bromide, and silver iodide all produce two ions in solution.

Let's look at the dissolution equation for silver chloride to see why this is true. And we could write out similar equations for silver bromide and silver iodide, so they all produce two ions in solution.

However, a salt like Lead II chloride produces three ions in solution. One plus two is three ions. Since Lead II chloride produces three ions in solution, we can determine its solubility relative to the other three by comparing Ksp values. Here are the Ksp values for the three salts at 25 degrees Celsius. For silver chloride, it's 1. And for silver iodide, it's 8. When comparing salts that produce the same number of ions, the higher the value of Ksp, the higher the solubility of the salt.

In this case the setup of the ICE table would look like the following:. When the K sp expression is written in terms of , we get the following result for the molar solubility. The Table below shows the relationship between K sp and molar solubility based on the formula. The K sp expressions in terms of s can be used to solve problems in which the K sp is used to calculate the molar solubility as in the examples above. Molar solubility can then be converted to solubility.

Read the material at the link below and do the problems at the end. Skip to main content. Calculation of K sp from Equilibrium Concentrations. We began the chapter with an informal discussion of how the mineral fluorite is formed. What is the solubility product of fluorite?

First, write out the K sp expression, then substitute in concentrations and solve for K sp :.