CaCz(s) + 2H2O() → CzHz(aq) + Ca(OH)2(aq)
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a. If 32.0 g Cacz are consumed in this reaction, how many moles of H2O are needed?

it's c (engineer's do their work with mechanical stuff not on any living being)

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l