How many grams are in 1 Eq of the following ions? How many...

How many grams are in 1 Eq of the following ions? How many grams in $1 \mathrm{mEq}$ ?
(a) $\mathrm{K}^{+}$
(b) $\mathrm{Br}^{-}$
(c) $\mathrm{Mg}^{2+}$
(d) $\mathrm{SO}_{4}^{2-}$
(e) $\mathrm{Al}^{3+}$
(f) $\mathrm{PO}_{4}^{3-}$

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Key Concepts

Equivalent Weight

Equivalent weight represents the mass of a substance that will combine with or displace a fixed quantity of another substance, typically hydrogen or oxygen in analytical chemistry. For ions, it is calculated by dividing the molar mass (formula weight) of the ion by the absolute value of its charge, providing a way to relate mass to the chemical reactivity or capacity in a reaction.

Milliequivalent

A milliequivalent (mEq) is defined as one-thousandth of an equivalent. It is commonly used in fields such as medicine and chemistry to express the concentration of ions in solution, especially when dealing with electrolyte balances and other situations where the electrical charge of ions is significant.

Valence

Valence, or oxidation state, indicates the number of electrons an atom or ion can donate, accept, or share during a chemical reaction. It is a key factor in determining the equivalent weight because the valence number serves as the divisor when calculating the mass corresponding to one equivalent.

Formula Weight

The formula weight is the sum of the atomic weights of all the atoms present in a chemical formula. It serves as the molar mass of a compound or ion and is a fundamental concept in stoichiometry, particularly used in the calculation of equivalent weights when combined with the ion's valence.

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