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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: firedamage on January 15, 2009, 09:45:15 AM

Title: who can give me the chemical equation??
Post by: firedamage on January 15, 2009, 09:45:15 AM
#As I am a new mechanical engineering student,i hardly follow up with the lecture..so in some case i need some help.
May anyone tell me what is the chemical equation for:

Ba(No3)2+NaHPO4=?

AgNO3+NaCO3=?

AgNO3+Na2HPO4=?

#what is the purpose in adding HNO3 into Ba(NO3)2+NaCO3?
#why the solution of Ba(NO3)2+NaCO3 become colourless after adding HNO3?
Title: Re: who can give me the chemical equation??
Post by: AWK on January 15, 2009, 09:57:21 AM
Should be Na2CO3

Al are reacrions of metathesis (double displacement) type

BaCO3 is decomposed to soluble Ba(NO3)2 salt
Ba2+ can form two phospates BaHPO4 in neutral solution and Ba3(PO4) in basic solution (Na2CO3 is strongly basic)
Title: Re: who can give me the chemical equation??
Post by: firedamage on January 15, 2009, 10:32:20 AM
means that Ba(NO3)2 make the solution to become colourless when we use HNO3 as indicator?
Then HNO3 act as an indicator?
Title: Re: who can give me the chemical equation??
Post by: AWK on January 15, 2009, 11:16:16 AM
Quote from: firedamage on January 15, 2009, 10:32:20 AM
means that Ba(NO3)2 make the solution to become colourless when we use HNO3 as indicator?
Then HNO3 act as an indicator?
No, it means that solid BaCO3 dissolves in HNO3 to form soluble nitrate
Title: Re: who can give me the chemical equation??
Post by: firedamage on January 16, 2009, 06:04:15 AM
may you give the chemical equation for:
Ba(No3)2+NaHPO4=?

AgNO3+NaCO3=?

AgNO3+Na2HPO4=?

Title: Re: who can give me the chemical equation??
Post by: Borek on January 16, 2009, 07:06:43 AM
Quote from: firedamage on January 16, 2009, 06:04:15 AM
may you give the chemical equation for:
Ba(No3)2+NaHPO4=?

AgNO3+NaCO3=?

AgNO3+Na2HPO4=?

All three will be obvious once you consult solubility table.
Title: Re: who can give me the chemical equation??
Post by: firedamage on January 16, 2009, 08:27:22 AM
why AgNO3+Na2HPO4=(yellow percipitate)?
and why Ba(NO3)2+Na2SO4=(white percipitate)?