Safety Precautions: Aprons
Do NOT taste anything in a science lab!
Materials: Test Tubes and rack
2 eyedroppers
4 funnels
Triple beam balance
8 plastic trays
solids
apron
8 spoons
iodine
water
marker
vinegar
watch glass
* 10 mL graduated cylinder – Vinegar AND 100 mL graduated cylinder - Water *
DO NOT CONTAMINATE CYLINDERS OR SOLID SUBSTANCES !
Procedures:
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
Make sure you have all materials. See materials list.
Label test tubes A, B, C, D.
Calibrate triple beam balance.
Measure 2 g. of sample A and pour into test tube A.
Measure 2 g. of sample B and pour into test tube B.
Measure 2 g. of sample C and pour into test tube C.
Measure 2 g. of sample D and pour into test tube D.
Pour approximately 2 mL of vinegar in each test tube. Observe for a vigorous gas and bubbles
reaction. Record observations in the section labeled vinegar for each substance – A, B, C, D.
One person should wash those four test tubes and another lab partner should label four clean test
tubes A, B, C, D.
Follow letter D above. Everyone in the group should take turns measuring and cleaning.
Add approximately 24 drops (1 mL) of iodine starch indicator to each of the three large test tubes
and observe for a blue-black color change. Record observations in the DATA table in the iodine box
for each substance – A, B, C, D.
Follow letter F above.
Follow letter D above.
Pour approximately 2 mL of water in each of the test tubes and observe which solid dissolves first.
Record observations in the data chart.
Follow F above.
Follow D above.
The solid not identified is sugar.