Calculate the number of equivalents in each of the following. Oh, so for the first one we have here is 1 mole of phosphoric acid. So this is an acid, and remember it is \( n \), which is the number of \( H^+ \) ions for the acid, times the moles of the acid. Here phosphoric acid has in it, 3 \( H^+ \) ions. So \( n \) equals 3 times, we're gonna say here 1 mole, so that equals 3 equivalents for phosphoric acid.
Now let's look at the base. Here we have \( \text{RbOH} \), which is a base. So the equivalence is equal to \( n \), which is the moles of number of \( OH^− \) times its moles. We know how many \( OH^− \) we have in this compound, we just have just 1. So \( n \) is 1. What we have to do now is figure out the moles of this particular base. So we're gonna have to convert grams to moles. Taking into account, we have 1 Rb, 1 oxygen, 1 hydrogen. So that's 1 mole. Looking up their masses on the periodic table and adding them together gives me a molar mass of 102.476 grams. Grams cancel out and now we're gonna have 0.026 moles of this base. So that number goes here. So one times that number means I have 0.026 equivalents of my base. So this is how you'd identify and calculate the equivalence of either an acid or a base.