Answer:
0.025M
Explanation:
Molarity (M) = number of moles (n) ÷ volume (v)
To find the mole of CaF2, we need to find its molar mass:
Ca= 40g/mol, F=19g/mol
CaF2 = 40 + 19 (2)
40 + 38
= 78g/mol.
Using; mole = mass/molar mass
mole = 7.85/78
mole = 0.1006
mole = 0.101mol
Molarity (M) = number of moles (n) ÷ volume (v)
Volume in Litres = 4025mL/1000
= 4.025L
Molarity (M) = 0.101/4.025
Molarity = 0.025M
