An erlenmeyer flask contains 25.00 ml of 0.500 m hcl before a titration is begun. how many moles of hydrogen ions are present in the flask at this time?
0.0125
12.5
20.0
50.0

0.0125 mol.

Explanation:

Molarity of a solution is the no. of moles of a solute per 1.0 L of the solution.

M of HCl = 0.5 mol/L.

V = 25.0 mL = 0.025 L.

∴ no. of moles of HCl present in the flask at this time = MV = (0.5 mol/L)(0.025 L) = 0.0125 mol.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.