Question

Calculate the solubility of Au(OH)3 in water (Ksp=5.5×10−46)(pH=7)

Answer 1

$pH + pOH = 14$

$POH=14-pH$

$pOH=14-7$

$pOH=7$

$[OH^{-}] =10^{-pH}$

$[OH^{-}] =10^{-7}$

$=[OH ^{-}] =1×10^{-7}M$