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How Much Gas Lab?


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How Much Gas Lab?

  1. 1. How Much Gas?<br />How much gas is created in the reaction of citric acid and sodium bicarbonate?<br />
  2. 2. How can we make the gas collection more accurate? <br />Problem- balloon allowed the gas to escape and not all of the gas from the experiment was collected and with other methods it might not give us specific answers<br />Solution- let’s change a few instruments <br />Instead of a balloon, let’s use a syringe with measurement markings on it<br />Check it out on the next slide<br />
  3. 3. Bottle & Syringe System<br />To make this, you are going to use a syringe, a stopper and a glass bottle.<br />The syringe stopper will go up as gas in the experiment is produced<br />The syringe has measurement markers to keep it accurate<br />
  4. 4. The materials for our lab:<br />Jar of sodium bicarbonate<br />Jar of citric acid<br />1 spoon, 2-mL<br />Glass bottle<br />#1 rubber stopper with hole<br />35-mL syringe<br />water<br />Protective eyewear<br />I will have organized these into material cubbies for you to use in class, but make sure everything is returned to the cubby for clean-up<br />Citric Acid Solution: we are going to use a citric acid solution of 2 mL of citric acid/100 mL of water to reduce lab error<br />
  5. 5. Here is our lab procedure: <br />Take a material cubby to your lab table.<br />Put on protective eyewear.<br />Put one level 2 mL spoon of sodium bicarbonate into the glass bottle. <br />Put stopper in the opening of the glass bottle.<br />Take up 5 mL of citric acid solution in the syringe.<br />Insert the tip of the syringe into the hole of the stopper.<br />Push the solution into the glass bottle using the syringe plunger. Don’t remove syringe.<br />Observe and record results.<br />
  6. 6. Last step…<br />8. Dump the used experiment into a sink and conduct two more trials. It is NOT necessary to wash out the bottle between trials.<br />
  7. 7. To Prepare for Class:<br />Write down the procedure for the lab, because we will not review this during class time.<br />Create a data table to record your observations. It could look like this…<br />
  8. 8. Be thinking about these things while completing the lab…<br />What causes the syringe plunger to go up during the reaction between citric acid and sodium bicarbonate?<br />Why is a syringe more useful than a balloon to conduct this experiment?<br />What really causes this reaction the sodium bicarbonate or the citric acid?<br />