Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Stoichiometry lab
| Question | Answer |
|---|---|
| What is the title of the lab experiment? | Stoichiometry Lab |
| What is the purpose of the lab experiment? | The objectives of this laboratory are to experimentally determine the mole-to-mole ratios and masses between the underlined reactants and products in the following double displacement “gas forming” reaction: |
| What is the double displacement "gas forming" reaction | sodium carbonate + aqueous hydrochloric acid →aqueous sodium chloride + carbon dioxide gas + liquid water Na2CO3 (s) + HCl (aq) → NaCl (aq) + CO2 (g) + H2O (l) |
| What is the safety part of the procedure? | Be especially careful when handling the 6M HCl (aq), as it can cause chemical burns to the skin. If any acid spills on you, rinse immediately under running water for up to 15 minutes and report the accident to your instructor. |
| What is the safety part of the procedure? (part 2) | Acid spills may also be neutralized using the sodium bicarbonate solution by the sinks. Also, be sure to exercise appropriate caution when using the Bunsen burner and handling hot equipment. (part 2) |
| What materials and equipment are needed in the lab? | Solid sodium carbonate (Na2CO3), 6M hydrochloric acid (HCl), electronic balance, evaporating dish, watch glass (to fit as a cover for the evaporating dish), stand and ring clamp, wire gauze, dropper pipette, stir rod and Bunsen burner. |
| What is the 1st step of the Experimental Procedure | Measure and record the mass of your clean dry evaporating dish. |
| What is the 2nd step of the experimental procedure | Measure 0.5 – 0.6 g of solid sodium carbonate (Na2CO3) and record the exact mass. Then carefully add to the evaporating dish. Do not do this over the balance! Then measure and record the mass of the evaporating dish + watch glass +Na2CO3. |
| What is the 3rd step of the experimental procedure. | Using your dropper pipette, add the HCl drop by drop to the sodium carbonate in the evaporating dish. You use about 5-mL quantity of hydrochloric acid (HCl). |
| What is the 3rd step of the experimental procedure. (part 2) | The reaction will be evident by the bubbling that takes place. Continue adding HCl until the bubbling stops and all of the Na2CO3 has reacted –this indicates that the reaction is complete. (part 2) |
| What is the 4th step of the experimental procedure. | Assemble the stand, ring clamp and wire gauze apparatus for heating as shown in the figure below. Cover the evaporating dish with the watch glass and place it on the wire gauze. |
| What is the 5th step of the experimental procedure | Gently heat the solution in the evaporating dish with a Bunsen burner flame in order to remove the water generated in the reaction (as well as any excess HCl present). The flame should be wafted under the evaporating dish constantly. |
| What is the 5th step of the experimental procedure (part 2) | Continue heating until the contents are completely dry. (When you think its dry, heat it 2 more minutes! – stop if white salt starts to turn brownish) (part 2) |
| What is the 6th step of the experimental procedure | After allowing the evaporating dish to cool to room temperature, measure and record the mass of the evaporating dish residue (NaCl). |
| What is the 7th step of the experimental procedure | The waste from this experiment may be disposed of in the sink. |
Created by:
Masterlearner5