4. In a test tube mix 1 g of Na COs with 3 mL of 6.0 M HCl If a gas evolves, wha
ID: 1042940 • Letter: 4
Question
4. In a test tube mix 1 g of Na COs with 3 mL of 6.0 M HCl If a gas evolves, what compound is responsible for it? What happens to the solution over time? Report the overall chemical reaction that accounts for the production of any gas you observe. Transfer about 1 g of KCIOs to a dry test tube. While holding the test tube with a test tube clamp, gently warm it using a Bunsen burner. Continue to heat test tube until reaction appears to stop. Record your observations associated with this station. Consider the physical properties of the elements thatm 5.Explanation / Answer
2)When 1.0g of Na2CO3 is mixed with 3mL of 6.0M HCl, we observe a reacion taking place with evolution of gas , noticed as bubbles coming out.
The gas is CO2 , we can identify it as CO2 by passing the evolved gas into a test tube of lime water which turns milky due to formation of insoluble CaCO3.
Now the reaction between Na2CO3 and Hcl is
Na2CO3(s) + 2HCl (aq) ---------------> 2 NaCl (aq) + CO2 (g)+ H2O (l)
The gas formed was CO2 from Na2CO3.
Over time as all the Na2CO3 is reacted, the evolution of gas stops.
The overall reaction that accounts for the gas formation is
Na2CO3(s) + 2HCl (aq) ---------------> 2 NaCl (aq) + CO2 (g)+ H2O (l)
3)When KClO3 is heated
we observe the salt is burnt to give a colorles gas , which rekindles the burning splinter. That shows it is oxygen gas.
The reaction is
2KClO3 (s) ---------------> 2KCl(s) + 3O2 (g)
The remaining solid is KCl .
4) The equation is
Na2CO3(s) + 2HCl (aq) ---------------> 2 NaCl (aq) + CO2 (g)+ H2O (l)
Reaction type : Acid-base neutralization , as well double decomposition.
Observation:
When Na2CO3solution is mixed with aqueous HCl, we observe a reacion taking place with evolution of gas , noticed as bubbles coming out.
The gas is CO2 , we can identify it as CO2 by passing the evolved gas into a test tube of lime water which turns milky due to formation of insoluble CaCO3.
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