00:01
This question involves the titration between a strong acid and a strong base.
00:07
Our strong acid is nitric acid, strong base sodium hydroxide.
00:11
It all begins with a balanced reaction because that's what's happening in a titration.
00:15
An acid and base are reacting, and when these two react we're going to produce water and sodium nitrate.
00:23
So notice that in the balanced reaction here everything reacts in a one -to -one ratio, and we are told here that the concentration of the base titrant is 0 .128 molar.
00:40
We're also told that it requires 28 .2 milliliters of that sodium hydroxide to neutralize the acid.
00:49
So let's first start by determining how many moles of sodium hydroxide are involved in that 28 .2 milliliters.
01:00
So notice again the concentration and molarity is moles of sodium hydroxide per liter of solution.
01:06
We need to have units of liters, so the milliliters here we're going to convert to liters.
01:13
It just amounts to moving that decimal place three places to the left, so that's going to give us 0 .0282 liters of sodium hydroxide, and we're going to multiply that number by the 0 .128 molar concentration to find out how many moles of sodium hydroxide that is...