Chemical Reaction Lab

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Lab Report 5

Introduction to the
Classes of Chemical Reactions

Course: Chem. 1151L, Tuesday & Thursday
June 23, 2011
Mr. Nasir Uddin
Pre Lab Questions:

1. CaBr2 (aq) + K3PO4 (aq) → CA(PO4)2(S) + KBr (aq) = Ca3(PO4)2 + 6 KBr Double Replacement
2. Li(s) + O2(g) = Li2O(s) =2 Li2O Decomposition

3. CH4 + O2 = CO2 + H2O = CO2 + 2 H2O Combination

4. AgBr(s) = Ag (s) + Br2(l) = 2 Ag + Br2 Combination

5. Mg(s) + H2SO4 (aq) = MgSO4 + H2 Decomposition

Table Three: Formation of Salt via Double Replacement Reaction

0.1 KNO3 * (NO3)2 0.1 M AgNO3
0.1M NaCl Tube 1: KNO3+NaCl Tube 3: Fe(NO3)3+NaCl Tube 5: AgNO3+NaCl
Prediction No change No change No change
Observation Change:
Liquid is no longer fluid Liquid became lighter Bubbles, carbon, color change, white separation
0.1M NaOH Tube 2: KNO3+NaOH Tube 4: Fe(NO3) 3+NaOH Tube 6: AgNo3+NaOH
Prediction No change Change Change
Observation No change Liquid became dark brown orange Color changed / brown / separation

Na2CO3 + HNO3 → NaNO3 + H2O + CO2

(Na2CO3 + HNO3) Liquid started to bubble – carbon dioxide

Procedure 3: Single Replacement Reactions

Table 1. Metals and the Reactivity Series; reaction with DI water.

Tube # & contents Name of Metal Prediction w/ DI H2O Observation
1. Control H2O No metal added Pure water only
2. Cu Copper No change No change
3. Fe Iron No change Color change- 3 min
4. Ca Calcium No change Instant, vigorous bubbles, boiling, warm
5. Mg Magnesium No change No change

Table 2. Metals and the Reactivity Series; reaction with 6M HCI.

Metals Name of Metal Prediction w/ HCI Observation
6. Control HCL No metal added HCI only No change
7. Cu Copper No change No change
8. Fe Iron Change Bubbles / Iron dissolved 5 min.
9. Ca Calcium No change Instant dissolve, bubbles, smell of gas, boiling
10. Mg Magnesium Change Bubbles appear instantly

Questions for Procedure2:

1. Ca + H2O = CaO+H2

Fe + 2HCI = FeCl2+H2

Ca + 2HCI = CaCl2+H2

Mg + 2HCI = MgCl2+H2

2. Pb(NO3)2 + NaOH = NaNO3 + Pb(OH)2

3. CaCl2 + NaOH = Ca(OH)2 + NaCl

Question for Procedure 3:

My prediction did not always agree with my observation. Calcium is an active metal. Metal can displace hydrogen from both water and hydrochloric acid. Cu, Fe and Mg are weaker and only react with acid as HCI.