00:03
Hi there.
00:04
In this question, we are given the hydroxide ion concentration, and we're told that it is equal to 2 .5 times 10 to the negative 4th molar.
00:20
And we want to know the hydrogen ion concentration, the h -plus concentration.
00:27
So to answer this question, we need the equation that tells us that the concentration, and this is for any aquaous solution, the hydrogen ion concentration, when multiplied by the hydroxide ion concentration, is equal to the kw of water.
00:47
And the kw of water is 1 times 10 to the negative 14.
00:54
Okay, so this equation is going to allow us to use that hydroxide ion concentration and solve for the h plus, because the h plus will be equal to 1 times 10 to the negative 14th, divided by the oh minus.
01:12
So i just rearrange this equation by dividing both sides by oh minus.
01:18
Okay, now we can plug in our value of oh minus and solve this equation.
01:25
So in the numerator, we have 1 times 10 to the negative 14th...