A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
A standard solution is a solution which contains an equivalent-gramme of the regarded element by liter of solution.
We also use multiples and submultiples of the standard solution ( solutions 2N, 5N, N/10, N/25, N/50...).