What mass of NaOH is contained in 2.5L
Of a 0.010M solution?
a 0.010g
B. 1.0g
c. 2.5g
D. 0.40g

B. 1.0g

Explanation:

Step 1

The molarity of the solution is 0.010 M, that is, there are 0.010 moles of sodium hydroxide per liter of solution. The moles of NaOH in 2.5 L of solution are:

Step 2

The molar mass of sodium hydroxide is 40.00 g/mol. The mass corresponding to 0.025 moles is:

There is 1.0 g of NaOH in the solution.

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