Wet Lab

Materials

  • 5 cups or beakers, each capable of holding 100mL acidic water
  • 5 stirs
  • Graduated Cylinder
  • Acid Water
  • Calcium carbonate
  • Lab Scale
  • pH Meter
  • Magic Marker or paper and pencil

Directions

Table 1:
CaCO3pH
3  
6  
9  
12  
15  
  1. Calibrate your pH meter if this has not already been done for you. Your teacher will provide you with information on how to calibrate your meter.
  2. Carefully measure 100mL of the acidic water your teacher has provided into each of the five cups
  3. Carefully measure and add 3 milligrams of calcium carbonate (CaCO3) to the first cup.
  4. Repeat step 2 for each of the remaining cups using 6, 9, 12, and 15 milligrams of CaCO3. Write the amount of CaCO3 on each cup using your magic marker, or label them with the pencil and paper.
  5. Stir each cup with its own stir until all of the calcium carbonate is dissolved in the cups. If you do not have enough stirs for each cup, rinse the stir between cups.
  6. Measure the pH of each cup, and record the result in Table 1.
  7. Open the MS Excel worksheet, and enter your data into the appropriate field.
  8. Go through the steps outlined on the Using Excel to Determine Cost handout.

Excel Directions

Step 1: Create an Excel Graph
Step 2: Add a Trendline
Step 3: Writing Excel Calculations
Step 4: Calculate Cost

Printable Directions