What molarity of KNO3 should be used in order for dilution of 63.2 mL to yield 253 mL of 0.319 M KNO3?

Use the dilution formula of

c1v1 = c2v2
c = concn (M)
v = volume

To determine the molarity (M) of the KNO3 solution needed for dilution, we can use the formula:

(M1)(V1) = (M2)(V2)

Where:
M1 = initial molarity (before dilution)
V1 = initial volume (before dilution)
M2 = final molarity (after dilution)
V2 = final volume (after dilution)

In this case:
M1 = ?
V1 = 63.2 mL
M2 = 0.319 M
V2 = 253 mL

Rearranging the formula to solve for M1, we get:

M1 = (M2)(V2) / V1

Substituting the given values, we have:

M1 = (0.319 M)(253 mL) / 63.2 mL

Calculating this expression, we find:

M1 = 1.280 M

Therefore, a molarity of 1.280 M KNO3 should be used for the dilution.