Lab report Precipitation reactions PDF

Preview

Summary

Download Lab report Precipitation reactions PDF

Description

Title: Precipitation reactions between different solutions Section: CHMG.145.01-25 - Gen & Analy Chem Lab I Name: Rafi Karim Lab Partners: Gavin Szarowicz and Robert Wolf Date performed: 11/01/2018

Table 5- Summary of Results Mixture Observations or “None”

Chemical Equations or “No Reaction”

1+2

Clear to white/cloudy precipitation

1.BaCl2(aq)+CuSO4(aq)→CuCl2(aq)+BaSO4(s) 2.Ba2+(aq)+2Cl-(aq)+Cu2+(aq)+ SO42-(aq)→Cu2+(aq)+2Cl-(aq)+BaSO4(s) 3.Ba2+(aq)+SO42-(aq)→ BaSO4(s)

1+3

Clear, no precipitate

No precipitate

1+4

Clear to milky

1.BaCl2(aq)+Na2CO3(aq)→2NaCl(aq)+BaCO3(s) 2.Ba2+(aq)+2Cl-(aq)+2Na+(aq)+CO32-(aq)→2Na+(aq)+2Cl-(aq)+BaCO3(s) 3.Ba2+(aq)+CO32-(aq)→ BaCO3(s)

1+5

Clear , No precipitate

1.BaCl2(aq)+2NaOH(aq)→2NaCl(aq)+Ba(OH)2(s) 2.Ba2+(aq)+2Cl-(aq)+Na+(aq)+OH-(aq)→Na+(aq)+2Cl-(aq)+BaCl2(s) 3.Ba2+(aq)+2Cl-(aq)→ BaCl2(s)

1+6

Clear to slightly cloudy. No visible precipitate

1.BaCl2(aq) + Na2S(aq) BaS(s) +2NaCl(aq) 2.Ba2+(aq)+2Cl-+2Na+(aq)+S2-(aq) BaS(s)+2NaCl(aq) 3.Ba2+(aq)+S2-(aq) BaS(s)

1+7

Clear. No Precipitate.

NR

2+3

No precipitate. Blue solution because solution 2 was blue.

NR

2+4

Slightly visible precipitate making clear liquid cloudy

1.CuSO4(aq)+Na2CO3(aq)→Na2SO4(aq)+CuCO3(aq) 2.Cu2+(aq)+SO42-(aq)+2Na+(aq)+CO32-(aq)→2Na+(aq)+ SO42-(aq)+CuCO3(s) 3.Cu2+(aq)+CO32-(aq)→CuCO3(s)

2+5

Clear to light blue precipitate, which sticks to sides

1. CuSO4(aq)+2NaOH(aq)→Na2SO4(aq)+Cu(OH)2(s) 2.Cu2+(aq)+SO42-(aq)+2Na+(aq)+2OH-(aq)→2Na+(aq)+SO42(aq)+Cu(OH)2(s) 3. Cu2+(aq)+2OH-(aq)→ Cu(OH)2(s)

2+6

Clear to soy sauce coloured (dark brown) liquid. Tiny black particles sticking to sides.

1.CuSO4(aq)+Na2𝑆(aq)→Na2SO4(aq)+CuS(s) 2. Cu2+(aq)+SO42-(aq)+2Na+(aq)+𝑆2-(aq)→2Na+(aq)+SO42(aq)+CuS(s) 3. Cu2-(aq)+𝑆2-(aq)→ CuS(s)

2+7

Clear to blue liquid. (because solution 2 was blue) No visible precipitate, just colour.

NR

3+4

Tiny particles, white precipitate forms.

1. CaCl2(aq)+Na2CO3(aq)→2NaCl(aq)+CaCO3(s) 2. Ca2+ (aq)+2Cl-(aq)+2Na+(aq)+CO32-(aq)→2Na+(aq)+2Cl-(aq)+CaCO3(s) 3. Ca2+(aq)+CO32-(aq)→ CaCO3(s)

3+5

Tiny particles in white liquid, but less than (3+4)

1. CaCl2(aq)+2NaOH(aq)→2NaCl(aq)+Ca(OH)2(s) 2. Ca2+(aq)+2Cl-(aq)+2Na+(aq)+2OH-(aq)→2Na+(aq)+2Cl-(aq)+Ca(OH)2(s) 3. Ca2+(aq)+2OH-(aq)→ Ca(OH)2(s)

3+6

No precipitate (But expected a precipitate because of the formation of CaS, which is insoluble)

Expected reaction: 1.CaCl2(aq)+Na2S(aq)CaS(s)+NaCl(aq) 2.Ca2+(aq)+2Cl-(aq)+2Na+(aq)+S2-(aq)CaS(s)+Na+(aq)+2Cl-(aq) 3.Ca2+(aq)+S2-(aq)CaS(s

3+7

No precipitate

No precipitate.

4+5

No precipitate

NR

4+6

No precipitate

NR

4+7

No precipitate

No precipitate.

5+6

No precipitate

NR

5+7

No precipitate

No precipitate.

6+7

No precipitate

No precipitate....