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The problem where if you want a find the PH and the POH of 0.3 molar a channel three nitric acid
before you try to do the ice chart the most important step is identify what kind of chemically you have
there's gonna be 10 different types of chemicals which leads to 10 different types of ice charts to calculate so
identifying the chemicals the first step to getting the right kind of ice chart
and identifying this case means we identified that we have a strong acid because a 1003 is one of the six strong acids
the fact that it's an acid means it's going to donate a proton to the water
the fact that its strong means the reaction goes 100% from left to right
so if we draw that donation
if we're a bath in each plus away from nitric acid were left with nitrate
and we add the two plus the water
we make a gurney
initial concentration of the acids 0.3
we don't need the water column
nitrate and had runnion both started zero
now the fact that it's a complete reaction 100% means we don't have any unknown taxes in our
eyes chart we know how much of this nitric acid is going to react
because it simply reaction means all 0.3 miles per liter goes away
and if we know the nitric acid loses 0.3 the nitrate has to gain 0.3
and so does the hide running
so whenever you have a strong acid or a strong base
strong chemicals means you'd never have any acts is in the ice chart
so there's nothing this all for this ice chart if we want the PH
we know what the concentration of hydro knee and is PH is the negative log of hydro Dion which is 0.3
and the negative log of 0.3 is 0.52
0.52 makes this makes sense because this is definitely
less than seven
seven is neutral at 25° and every problem
will be assumed to be at 25°
unless
the temperatures specified as something else
and when there's no temperature given we know the temperatures 25° so PH 0.52 is definitely acidic which makes sense for strong acid
and we can meet then use the formula PH plus POH
equals 14
to calculate
the POH
which is 13.4
eight
here's a similar problem 25° is not temperatures given by the PH appeal each appoint for molar barium hydroxide
Darian hydroxide that's a group two cat ion barium paired up with a hydroxide
which means we have a strong betas
and the strong bases are unique in the sense that
strong bases are all salts and if you have a salt that dissolves in water you know that ayanna compounds dissociate when air and water
so this is the only type of chemical
and we said at the ice chartist low bit differently instead of writing plus water
all we have to do for this
is write a single a row because we know it's wrong
and then we does write down the dissociate shun Burien hydroxide associates
forms the Burien cat ion and two hydroxide an aunt's
if you wrote a strong base plus water
you gonna end up with exactly the same two products seeking try it right down the reaction ban hydroxide
reacts with water and you'll see that you get exactly the same two products if you drier heroes correctly
so the initial concentration of the gran hydroxide a 0.4
the cat I'm the NAIA nine are below zero
we never had any taxes and the ice chart if it's a strong acid are strong base
so 100% reaction means
all the very loud rock side goes away
the Burien is can increase by 0.4
and the hydroxide going to increase by 0.8 because of that coefficient of two every time one
Burien hydroxide reacts we make two hydroxide says
so the goal was fined the PH in the POH
we can find a POH
first
the negative lauded by dockside means the negative log of 0.8
which is
0.10
and the PH is 14 -2 POH
shall be
13.
90
definitely basic 13.9 higher than seven
which it had to be when you put a strong base into water