sidewalk chalk with a little science magic by creating a chalk-based paint and
then spritzing on a little fizz. It all starts with pH. When solutions that are
pH base mix with an acid, action happens!
vinegar—1 per child
baking soda and the cornstarch together. Add the warm (almost hot) water,
stirring until it is the consistency of pancake batter. Split the recipe into
several containers, adding the food coloring color of your choice to each.
scene or flick it with a paintbrush into a modern masterpiece. It is best to
work fast because the paint dries quickly (but can always be diluted with the
addition of more warm water).
time for something a little extra. Spray the artwork with the vinegar-filled
bottle and watch what happens. Your artwork will sizzle and pop!
across the art can make it disappear. Because that is fun, too, you might not
want to wait for rain.
negotiate in the paint, give your children a spoon and let them drip or drop
spoonfuls of paint onto the pavement. For the little ones, be sure to fully
supervise when they spray vinegar. It can sting little eyes.
work in a lesson on reactions between acids and base chemicals and talk about
why this works. Maybe you can have your budding scientists adapt the recipe to
see whether they can get bigger bubbles and more fizz in their next batch of
preschooler? Use a turkey baster to squirt vinegar at the paint. The grasping
and squeezing helps strengthen finger muscles they will use when they are writing.
Our Experience with Fizzing Sidewalk Paint
My kids added way more vinegar than was required because it was so cool to watch the sidewalk paint bubble up.
Besides being a fun painting experience, this activity teaches kids a little about science and reactions, while the spraying of the vinegar helps to strengthen little hand muscles.