Solubility Product Constant (Ksp)

We've learned that some ionic solids are totally water insoluble, but in fact this is a slight oversimplification. Even such solids will dissolve to some minuscule degree, and we can measure this, and do calculations with it. Let's learn about solubility product constants!

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[NourAhmed-gojo]

7:53 x = 1.3 * 10 ^-3 not -9

for anyone who found it confusing it's just a mistake in the video

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[natan-elmensahsowah]

Thank you !! However, I have a question. I understand that for (OH)2 in Ca(OH)2, 2 is the coefficient for OH and becomes its exponent when calculating Ksp. How do you decide to use the subscript as a coefficient. I was wondering why in the last question PbI2, 2 was used as the coefficient? The reason why I am confused was because in the CaCO3 example, 3 was not used as a coeeficient : just [Ca][CO]?