Question

2. What will you observe when you have a positive test for: (a) bicarbonate anion(HCO3-)? • Bubbles Dobre lieT like gas o colorless (b) phosphate anion(PO43-)?

Answer 1

The reactions that occur are:

a) Molecular:

Cu (NO3) 2 + 2 NaOH = Cu (OH) 2 + 2 NaNO3

Total ionic:

Cu + 2 + 2 NO3- + 2 Na + + 2 OH- = Cu (OH) 2 + 2 Na + + 2 NO3-

Net ionic:

Cu + 2 + 2 OH- = Cu (OH) 2

b) Molecular:

Pb (NO3) 2 + 2 HCl = PbCl2 + 2 HNO3

Total ionic:

Pb + 2 + 2 NO3- + 2 H + + 2 Cl- = PbCl2 + 2 H + + 2 NO3-

Net ionic:

Pb + 2 + 2 Cl- = PbCl2

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