DIFFERENCE BETWEEN SODIUM AND SALT - Technically salt can be any ionic compound formed by reacting an acid and a base, but most of the time the word is used to refer to table salt, which is sodium chloride or NaCl. So, you know salt contains sodium, but the two chemicals aren't the same thing. Sodium is a chemical element. It is very reactive, so it isn't found free in nature. In fact, it undergoes spontaneous combustion in water, so while sodium is essential for human nutrition, you wouldn't want to eat pure sodium. When you ingest salt, the sodium, and the chlorine ions in sodium chloride separate from each other, making the sodium available for your body to use. Sodium is used to transmit nerve impulses and is found in every cell of your body. The balance between sodium and other ions regulates the pressure of cells and is related to your blood pressure, too. Since sodium levels are so critical to so many chemical reactions in your body, the amount of sodium you eat or drink has important implications for your health. If you are trying to regulate or limit your intake of sodium, you need to realize the quantity of salt you eat is related to the amount of sodium but is not the same. This is because salt contains both sodium and chlorine, so when salt dissociates into its ions, the mass is divided (not equally) between sodium and chlorine ions. The reason salt isn't just half sodium and half chlorine is because a sodium ion and a chlorine ion don't weight the same amount. While table salt is an obvious source of sodium, the CDC reports 40% of dietary sodium comes from 10 foods.

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The Difference Between Sodium and Salt

By Anne Marie Helmenstine, Ph.D.

 

Technically salt can be any ionic compound formed by reacting an acid and a base, but most of the time the word is used to refer to table salt, which is sodium chloride or NaCl.

So, you know salt contains sodium, but the two chemicals aren't the same thing.

Sodium

Sodium is a chemical element. It is very reactive, so it isn't found free in nature.

In fact, it undergoes spontaneous combustion in water, so while sodium is essential for human nutrition, you wouldn't want to eat pure sodium.

When you ingest salt, the sodium, and the chlorine ions in sodium chloride separate from each other, making the sodium available for your body to use.

Sodium in the Body

Sodium is used to transmit nerve impulses and is found in every cell of your body.

The balance between sodium and other ions regulates the pressure of cells and is related to your blood pressure, too.

Amount Of Sodium in Salt

Since sodium levels are so critical to so many chemical reactions in your body, the amount of sodium you eat or drink has important implications for your health.

If you are trying to regulate or limit your intake of sodium, you need to realize the quantity of salt you eat is related to the amount of sodium but is not the same.

This is because salt contains both sodium and chlorine, so when salt dissociates into its ions, the mass is divided (not equally) between sodium and chlorine ions.

The reason salt isn't just half sodium and half chlorine is because a sodium ion and a chlorine ion don't weight the same amount.

Sample Salt and Sodium Calculation

For example, here is how to calculate the amount of sodium in 3 grams (g) of salt. You will notice 3 grams of salt does not contain 3 grams of sodium, nor is half the mass of salt from sodium, so 3 grams of salt does not contain 1.5 grams of sodium:

·           Na: 22.99 grams/mole

·           Cl: 35.45 grams/mole

·          1 mole of NaCl = 23 + 35.5 g = 58.5 grams per mole

·         Sodium is 23/58.5 x 100% = 39.3% of salt is sodium

Then the amount of sodium in 3 grams of salt = 39.3% x 3 = 1.179 g or about 1200 mg

An easy way to calculate the amount of sodium in salt is to realize 39.3% of the amount of salt comes from sodium.

Just multiply 0.393 times the mass of the salt and you will have the mass of sodium.

Top Dietary Sources of Sodium

While table salt is an obvious source of sodium, the CDC reports 40% of dietary sodium comes from 10 foods.

The list may be surprising because many of these foods don't taste particularly salty:

·               Bread

·               Cured meats (e.g., cold cuts, bacon)

·               Pizza

·               Poultry

·               Soup

·               Sandwiches

·               Cheese

·               Pasta (usually cooked with salted water)

·               Meat dishes

·               Snack foods

Anne Marie Helmenstine, Ph.D.

Chemistry Expert

Education

Ph.D., Biomedical Sciences, University of Tennessee at Knoxville

B.A., Physics and Mathematics, Hastings College

Introduction

Ph.D. in biomedical sciences from the University of Tennessee at Knoxville - Oak Ridge National Laboratory.

Science educator with experience teaching chemistry, biology, astronomy, and physics at the high school, college, and graduate levels.

ThoughtCo and About Education chemistry expert since 2001.

Widely-published graphic artist, responsible for printable periodic tables and other illustrations used in science.

Experience

Anne Helmenstine, Ph.D. has covered chemistry for ThoughtCo and About Education since 2001, and other sciences since 2013. She taught chemistry, biology, astronomy, and physics at the high school, college, and graduate levels. She has worked as a research scientist and also abstracting and indexing diverse scientific literature for the Department of Energy.

In addition to her work as a science writer, Dr. Helmenstine currently serves as a scientific consultant, specializing in problems requiring an interdisciplinary approach. Previously, she worked as a research scientist and college professor.

Education

Dr. Helmenstine holds a Ph.D. in biomedical sciences from the University of Tennessee at Knoxville and a B.A. in physics and mathematics with a minor in chemistry from Hastings College. In her doctoral work, Dr. Helmenstine developed ultra-sensitive chemical detection and medical diagnostic tests.

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