Unit 4 Home Experiment
Percent of Sodium bicarbonate in an Alka-Seltzer Tablet
If you worked in a group, make sure to include the names of all who worked with you on your report.
Purpose: You will determine the percent by mass of sodium bicarbonate in an alka seltzer tablet.
Background: Alka-Seltzer Tablets consist of mainly of sodium bicarbonate and citric acid (H3C6H5O7) (loses 3 H+=s, the citrate ion is C6H5O7-3). When dissolved in water, a neutralization reaction occurs between the two.
Procedure: Design an experiment to measure the percentage of sodium bicarbonate.
- You should start by writing an equation for the reaction between sodium
bicarbonate and citric acid when they both become dissolved in water. (include
- Write up a procedure.
- Hint: When doing the experiment, you will have to measure the amount
of another substance in the equation, and then use stoichiometry to find
out how much sodium bicarbonate reacted.
- Then you can calculate the % sodium bicarbonate in tablet (assume there is no excess sodium bicarbonate).
- Be sure to include a formula with no numbers for how you will calculate
the % sodium bicarbonate in the tablet. B Then show the numbers plugged in,
and finally, the answers.\
- Set up a data table of all measurements you will need to record before you perform the experiment.
- Bring your data table, procedure, and alka seltzer (or generic version)
tablet to class with you. You can use my equipment during flex, before, or
after school to collect data
- Write up your results, showing how you arrived at your answers and discuss how valid you think your results are and why.