SPECIAL ASSIGNMENT WRITING NET IONIC EQUATIONS Mcst of the equations that we hav
ID: 1039157 • Letter: S
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SPECIAL ASSIGNMENT WRITING NET IONIC EQUATIONS Mcst of the equations that we have written up unfl this point have been molecular equations. The molecular equation oontains the compiele formula for each substanos appearing in the equation During reactions in aqueous soluion, it s not always immeciately apparent which molecules or ions are reacting and which are being produced. The NET ONIC EQUATION shows the actual reaction happening in solution In the total onic equation, the substances that exst primarily as ions are writen in ioric fom. Sucestances that primarly exist as moleculss are written in molecular form. Compare the molecular and botal ioric equation for the reaction of HCl and KOH Total lonic equation H(an+Cl RULES TO WRITE SUBSTANCES IN IONIC FORM: Strong acids, strang solubie bases, and saluble salts are written in ionic form. · weak acds, weak bases, strong nsoluble bases, and oter molecular substance such as water are written in molecular form Insoluble solids, liquids, and gases are written in molecular form. Comparing the two sides of the total onic equation note that Cl lag) and K laq) are the same at both sides. These two iens remain unchanged during the reaction ftereftre they are caled SPECTATOR IONS jions that do not participale in the maction). The net ioric equaton will be Net lonic equatior H. [aq) +OH(aq) ? H,0 The net lonic equation shows that the reaction occurs between these two ions: H (ac) and Ot (ag). The importance af net ionic equations is that ey gwe an insight imo what really happens in solution Lets corsider te reaction between a weak acid and a strong base Molecular equation Total lonic equation CHOOOH(ac).wiaq} +0tt (a) ? CHC00 (a).Na.(ac).HOOO Note that sodium ion is the spectatr ion. Since acetic acid is a weak acid it doesnt onze 100 %, therefore we must write t as a molecule and not ionized. The net ionic equation is as fclows Net ionic equation: 72Explanation / Answer
1.
Molecular equation :
Al2S3 (aq.) + 2 FeCl3 (aq.) ------------> Fe2S3 (s) + 2 AlCl3 (aq.)
Total ionic equation :
2 Al3+ (aq.) + 3 S2- (aq.) + 2 Fe3+ (aq.) + 6 Cl- (aq.) ---> Fe2S3 (s) + 2 Al3+ (aq.) + 6 Cl- (aq.)
Net ionic equation :
2 Fe3+ (aq.) + 3 S2- (aq.) -------------> Fe2S3 (s)
2.
Molecular equation :
3 KOH (aq.) + Cr(NO3)3 (aq.) --------> Cr(OH)3 (s) + 3 KNO3 (aq.)
Total ionic equation :
3 K+ (aq.) + 3 OH- (aq.) + Cr3+ (aq.) + 3 NO3- (aq.) -----> Cr(OH)3 (s) + 3 K+ (aq.) + 3 NO3- (aq.)
Net ionic equation :
Cr3+ (aq.) + 3 OH- (aq.) ------------> Cr(OH)3 (s)
3.
Molecular equation :
Zn (s) + Cu(NO3)2 (aq.) -----------> Zn(NO3)2 (aq.) + Cu (s)
Total ionic equation :
Zn (s) + Cu2+ (aq.) + 2 NO3- (aq.) -------> Zn2+ (aq.) + 2 NO3- (aq.) + Cu (s)
Net ionic equation :
Zn (s) + Cu2+ (aq.) -----------> Zn2+ (aq.) + Cu (s)
4.
Molecular equation :
3 AgNO3 (aq.) + K3PO4 (aq.) ------------> Ag3PO4 (s) + 3 KNO3 (aq.)
Total ionic equation:
3 Ag+ (aq.) + 3 NO3- (aq.) + 3 K+ (aq.) + PO43- (aq.) ---> Ag3PO4 (s) + 3 K+ (aq.) + 3 NO3- (aq.)
Net ionic equation :
3 Ag+ (aq.) + PO43- (aq.) --------------> Ag3PO4 (s)
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