# How can I measure the amount of salt on McDonald's french fries? For a project, I am going to be comparing the amount of salt actually put on the french fries, to the amount they claim is on them...

How can I measure the amount of salt on McDonald's french fries?

For a project, I am going to be comparing the amount of salt actually put on the french fries, to the amount they claim is on them in the nutrition facts, only problem is, i can't figure out how to do it.

ndnordic | Certified Educator

Weigh out a measured amount of french fries so you have a starting amount in grams.

Put the french fries in enough water to cover them and gently stir them to dissolve the salt.

Filter the water/french fries through some filter paper to remove any small pieces of french fries and collect the filtered water.

Let the water evaporate and weigh the salt that has been left behind. This will tell you how much salt was on the french fries in grams.

If you want to know the % salt, then divide the mass of the salt (grams) by the mass of the french fries you started with and multiply by 100.