Illustrated Guide to Home Chemistry Experiments

214 DIY Science: Illustrated Guide to Home Chemistry Experiments

Item Trial A Trial B Trial C

A. Mass of tablet ________.___ g________.___ g________.___ g

B. Mass of cup + water ________.___ g________.___ g________.___ g

C. Temperature of water ________.__ °C________.__ °C________.__ °C

D. Mass at 0:00 (A + B) ________.___ g________.___ g________.___ g

E. Mass at 0:05 ________.___ g________.___ g________.___ g

F. Mass at 0:10 ________.___ g________.___ g________.___ g

G. Mass at 0:15 ________.___ g________.___ g________.___ g

H. Mass at 0:20 ________.___ g________.___ g________.___ g

I. Mass at 0:25 ________.___ g________.___ g________.___ g

J. Mass at 0:30 ________.___ g________.___ g________.___ g

K. Mass at 0:35 ________.___ g________.___ g________.___ g

L. Mass at 0:40 ________.___ g________.___ g________.___ g

M. Mass at 0:45 ________.___ g________.___ g________.___ g

n. Mass at 0:50 ________.___ g________.___ g________.___ g

O. Mass at 0:55 ________.___ g________.___ g________.___ g

P. Mass at 1:00 ________.___ g________.___ g________.___ g

Q. Mass at completion of reaction________.___ g________.___ g________.___ g

R. Mass loss (D – Q) ________.___ g________.___ g________.___ g

S. Mass loss percentage [(R/A) · 100]________.___ %________.___ %________.___ %

TABLE 12-1: Effect of temperature on reaction rate—observed and calculated data

oALIpToN ACTIvITIES

If you have time and the required materials, consider performing these optional activities:

• Graph your results for the trials using cold, hot, and warm water. Determine whether the reaction rate is
  linear over time and whether the reaction temperature affects linearity.


• The main component of fizzy tablets is sodium bicarbonate, usually mixed with citric acid, aspirin,
  binders, and other inactive components. When it comes into contact with water, the citric acid and
  sodium bicarbonate react to form (among other products) carbon dioxide. The carbon dioxide is evolved
  as a gas, which accounts for the mass loss. Write a balanced equation for this reaction, and use the data
  from Table 12-1 to calculate the approximate percentage of sodium bicarbonate by weight in the tablet.