Biology; Chemistry; Physics: Post your doubts here!

[funky brat]

Okay, I'm stuck with an ionic equation. The question says ocnstruct an ionic equation for reaction between carbonate and acid.
For example,
CaCO3+ 2HCl= CaCl2+ CO2+ H2O
Now I break the equation down Ca^+2 CO3^-2 + 2H^+ 2Cl^- ---> Ca^+2 + 2Cl^-
Now what do I do next which ones to cancel?

Anyone answer asap. :/

 

[funky brat]

you took away so many things on right side

Can you please elaborate?

 

[Faizan Muhammmad]

state symbols help btw
do use them
it makes it easier

 

[funky brat]

state symbols help btw
do use them
it makes it easier

I'll put them, but what to do next, can you help out please?

 

[Faizan Muhammmad]

Can you please elaborate?

CaCO3 is insoluble it wont be cut off
H+ and Cl- can be cut off
Ca +2 and Cl -1 on other side can be
common is Cl- so we remove it
we are left with
CaCO3+ 2H+ = Ca^2+ + CO2+ H2O

 

[funky brat]

CaCO3 is insoluble it wont be cut off
H+ and Cl- can be cut off
Ca +2 and Cl -1 on other side can be
common is Cl- so we remove it
we are left with
CaCO3+ 2H+ = Ca^2+ + CO2+ H2O

You said H can be cut off but you included. :/
So insoluble ones are included in the ionic equations?

 

[Faizan Muhammmad]

Total charge on both sides should be same
there should be no same ion or compound or any side
and all atoms on either side should add up to same number

 

[Faizan Muhammmad]

You said H can be cut off but you included. :/
So insoluble ones are included in the ionic equations?

It can be cut off
but to cut it should be present on other side too, which it isnt so we wont

 

[Faizan Muhammmad]

You said H can be cut off but you included. :/
So insoluble ones are included in the ionic equations?

unless you cut the whole compound from either side the insoluble stuff doesnt go anywhere

 

[Hamza_Akmal]

graph should be like this??? (just to make sure..) thanks!!
View attachment 42212

wrong, don't extend to axes!

 

[funky brat]

unless you cut the whole compound from either side the insoluble stuff doesnt go anywhere

According to mark scheme the ionic equation is this
2H+ + CO32- → H2O + CO2 (1)
They did not include Calcium.

 

[Uchiha-Sasuke]

Anyone answer asap. :/

We don't cancel H2O, CO2 or precipitate
CaCO3+ 2HCl= CaCl2+ CO2+ H2O
Ca+ ..CO3-.. 2H+..2Cl-...= Ca+..Cl-..CO2 +H2O
CO3- ... 2H+.... = CO2 + H2O

 

[Faizan Muhammmad]

According to mark scheme the ionic equation is this
2H+ + CO32- → H2O + CO2 (1)
They did not include Calcium.

 

[Faizan Muhammmad]

We don't cancel H2O, CO2 or precipitate
CaCO3+ 2HCl= CaCl2+ CO2+ H2O
Ca+ ..CO3-.. 2H+..2Cl-...= Ca+..Cl-..CO2 +H2O
CO3- ... 2H+.... = CO2 + H2O

calcium carbonate is insoluble
how are you making ions of that?

 

[Awesome12]

wrong, don't extend to axes!

No he is correct. The marking scheme itself says it
two intersecting straight lines (2) (1 mark for one straight line)

 

[Uchiha-Sasuke]

calcium carbonate is insoluble
how are you making ions of that?

Dude that's for precipitate and precipitate are not something we add as reactants its the insoluble PRODUCTS

 

[Hamza_Akmal]

y

No he is correct. The marking scheme itself says it
two intersecting straight lines (2) (1 mark for one straight line)

ou have to intersect the 2 lines.. just dont extend them to the axes

 

[Faizan Muhammmad]

Dude that's for precipitate and precipitate are not something we add as reactants its the insoluble PRODUCTS

you lost me
please explain

 

[Hamza_Akmal]

you lost me
please explain

A precipitate is an insoluble solid that is a product of a reaction.

 

[funky brat]

you lost me
please explain

CaCO3 is inslouble, we all know. But you can make ions of it when it is present as the reactant. If this was the product, then you can't make ions of it. That's what he meant.