When is Ksp determined for a system? at any time that the solid and liquid phases are both present
only after all solid has been dissolved
when equilibrium is established
when the two phase system is saturated

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution. calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer