Question

Which of the following reactions will result in the formation of an insoluble salt?
a) lithium carbonate with ammonium phosphate
b) zinc nitrate with sulfuric acid
c) sodium nitrate with silver acetate
d) calcium chloride with sulfuric acid
e) cesium sulfate with ammonium hydroxide

Answer 1

@UnkleRhaukus

Answer 2

@aaronq

Answer 3

@CShrix

Answer 4

@LeibyStrauss

Answer 5

@Photon336

Answer 6

insoluble means that the compound will settle at the bottom of your flask. I think we need to use the solubility rules here.

Answer 7

Nitrate is always soluble right?

Answer 8

Usually they are. but keep in mind that there are some exceptions too. When I saw this question I looked at the compound with silver in it. let's work this out.

Answer 9

And Lithium and NH4+ usually is.

Answer 10

Alright

Answer 11

These reactions are usually double replacement.

Answer 12

So are they already swapped or do they need to be swapped?

Answer 13

They aren't right?

Answer 14

Well keep in mind that you always need to swap them

\[AB+CD -->AC +DB \]

Answer 15

Alright

Answer 16

So with the first one it would be Li3PO4 and ammonium carbonate?

Answer 17

correct

(NH4)3PO4 + 3LiOH --> 3NH4OH+Li3PO4

Answer 18

And Li usually is soluble along with NH4

Answer 19

yep

Answer 20

Check this out

AgNO3 + NaCH3COO ---> AgCH3COO + NaNO3

Answer 21

So it's not that one

Answer 22

yeah because they are both soluble

Answer 23

Acetate is usually soluble

Answer 24

Along with Na

Answer 25

Yeah, But I think the presence of Silver changes that

Answer 26

Remember

Answer 27

Always do the double replacement first then balance out the equation at the end. and then use your solubility rules at the end.

Answer 28

But is it an exception for acetate?

Answer 29

1. Do double replacement reaction
2. Balance equation.
3. Apply solubility rules for each product.

AgNO3 + NaCH3COO ---> AgCH3COO + NaNO3

Acetates are pretty soluble, but the presence of silver might reduce the solubility of that compound.

Answer 30

So that one is a maybe

Answer 31

yeah but there's gotta be a better answer

Answer 32

I looked at that one immediately because there's silver in it.

let's work out the last one:

cesium sulfate with ammonium hydroxide

Answer 33

Btw is it magnesium or cesium?

Answer 34

Cesium

Answer 35

yeah I think i'm going to go with silveracetate as the answer unless someone else has a different answer.

Answer 36

Alright. Thank you!! I was looking over the rules and such and it's the only one I could see too. According to the rules we were given in the notes.

Answer 37

@staldk Can you write out the formula for sulfuric acid or name the polyatomic ion it is made up of?

Answer 38

It's H2SO4 isn't it?

Answer 39

What are the rules for SO4?

Answer 40

Soluble unless it's with Sr2+, Ba 2+, Hg 2+, or Pb 2+

Answer 41

You're missing one exception. See rule 5 http://www.chem.sc.edu/faculty/morgan/resources/solubility/

Answer 42

I'll make sure to add that into my notes.

Answer 43

With which element would SO4 form a precipitate?

Answer 44

Ca2+

Answer 45

Is Ca one of the possibilities of reacting with SO4?

Answer 46

Yes. So it should be the calcium chloride with sulfuric acid?

Answer 47

I think so.

Answer 48

If you look at rule 3 http://www.chem.sc.edu/faculty/morgan/resources/solubility/ Acetate is soluble there are no exceptions.

According to rule 5 calcium chloride with sulfuric acid will be insoluble.

Answer 49

My notes say the rule about acetate.

Answer 50

What does your note say about acetate?

Answer 51

I guess my professor forgot to mention some or something.

Answer 52

Acetate has no exceptions.

Answer 53

That is correct. That's why acetate won't form an insoluble salt.

Answer 54

Right

Answer 55

It makes sense to be that one after reading through the rules you sent. Thanks