The rules state that subscripts cannot be added or changed:
However in the question a subcript has been added:
Balance this equation and show in molecular form
lead(II)nitrate+sodium chloride-->
answer: Pb(NO3)2+2NaCl->
PbCl2(s)+2NaNO3
A subscript has been added against Cl in PbCl which goes againist the rules.
I hope somebody can help!!
2007-09-19 15:03:43 · 7 answers · asked by Gideon 1 in Science & Mathematics ➔ Chemistry
PbCl is not a compound. Pb has a 2+ charge, so the formula of lead (II) chloride is PbCl2. You're not actually adding a subscript to balance the equation, but predicting the products and then balancing the equation using coefficients.
2007-09-19 15:13:28 · answer #1 · answered by killercayenne 2 · 0⤊ 0⤋
The rule is that you can't change subscripts to balance the equation. That doesn't mean you don't change subscripts when moving from products to reactants. It means that you couldn't write NaCl2 in order to balance the equation. Or that you couldn't change the PbCl2 to PbCl so that it would be balanced.
In other words, the subscripts were placed there because that is the formula for the compound. I'd hope you'd know this before you got to actually balancing an equation.
2007-09-19 15:14:05 · answer #2 · answered by Melissa Me 7 · 0⤊ 0⤋
The subscript is added to make the formula of PbCl2 correct. From the formula of Pb(NO3)2, you can tell that the Pb ion is Pb2+. Since a chloride ion has only a charge of -1, you need to Cl- ions for each Pb2+ ion.
Hope this helps...
2007-09-19 15:08:02 · answer #3 · answered by hcbiochem 7 · 0⤊ 0⤋
the lead has a +2 charge while chloride has a -1 those therefore you need 2 of them.
You can add subscripts for the charges not to balance the equations.
lead(II) Chloride's molecular is pbcl2
that has nothing to do with balancing the equation
it has to do with the charges
2007-09-19 15:10:57 · answer #4 · answered by x3floridagurl3x 3 · 0⤊ 0⤋
subscripts of a compound can't be added or changed. to change a subscript of a compound changes it's composition and results in a totally different compound.
Pb(NO3)2 is a compound; you can't change the 2 to a 3 to balance an equation : Pb has a valence of +2 and can't combine with 3 NO3-.
2007-09-19 15:48:36 · answer #5 · answered by skipper 7 · 0⤊ 0⤋
it doesnt go againt the rules at all. lead (Pb) has a charge of 2+. chlorine (Cl) has a charge of 1-. the substance needs to be neutral, or else it will become an ion. 2 chlorines need to be used to neutralize the charge of the lead
trust me, im in ap chemistry
2007-09-19 15:07:51 · answer #6 · answered by Luigi 3 · 0⤊ 0⤋
you multiply the coefficients and subscripts; you would have 8 hydrogen atoms, and 4 oxygen atoms
2016-05-18 23:38:45 · answer #7 · answered by Anonymous · 0⤊ 0⤋