00:01
In this question we've been given some chemical names and we've been asked to determine the chemical formulas.
00:06
So the tricking answer in such a question is to identify the ket ion and the n -ion from the name that we've given.
00:14
So for the first one, if we look at the first compound that we've been given, it's sodium, sulphide.
00:21
So from that name we can tell that it consists of our sodium, which is our ket -ion and a sulphide ion, which is so3 -2 -minus.
00:30
That is going to be our n -ion.
00:32
So combining these two, this is going to be sodium s -o -3.
00:38
So this is our sodium sulfide.
00:41
And then moving on to the next one, in the next compound we have been given potassium phosphate.
00:47
From that name, we can tell that this is made of potassium.
00:50
This is potassium plus and a phosphate ion, which is p -o -4 -3 -1...