Acid vs Acidic
Those who have studied chemistry at junior level know how important the concept of pH is to classify an aqueous solution as acidic or alkaline. It is not just chemistry but biology, agriculture, food science, nutrition, medicine, ecology and many other fields that the concept of pH finds applications. The value of pH ranges from -7 to +7 where -7 is a solution that is most acidic and +7 is the most alkaline solution. We purify water to remove any acidity that may be present in the form of impurity so as to make it potable. While a low pH value indicates high concentration of hydroxonium ions (H+) a high pH means very low concentration of H+ ions. Change in pH value by a unit means 10 times more acidic or basic solution. Acids are substances having a pH value of less than 7 and they react with metals and bases. One characteristic of acids is that they taste sour. Let us clarify the concepts of acids and acidic further by taking a closer look.
Chemicals or substances having properties of acids are termed as acidic. However, this may not be true for foods that we consume. Food items are termed as alkaline or acidic depending upon their ability to produce basic or acidic ash inside stomach after their digestion. This is why foods are classified as alkaline or acidic and doctors advice us to include more and more of alkaline foods in our diet. When we eat foods, they get oxidized inside the body and after digestion they leave a residue or ash. If this residue contains minerals such as sulfur, phosphorus, chlorine, and organic acid radicals more than sodium, potassium, calcium and magnesium, the foods are termed as acidic. On the other hand, converse of this phenomenon is also true and the foods are then termed as alkaline. It should be our aim to include more of alkaline foods in our diet.
As told earlier, even a unit change in pH value indicates a 10 times shift in acidity. However, around the extreme values, even a minor deviation constitutes much greater change in acidity or basicity than even major changes around the neutral mark.
When a dietician explains acid and alkaline foods, he is actually referring to the condition of food after digestion. In fact there are many substances that are basically acidic in nature but become alkaline after being broken down inside the body. It is not the alkaline or acidic taste of a substance while being taken (such as a lemon juice) that is important. It is how the substance changes the pH value inside the body, making the body more alkaline or acidic that is more significant.
Difference Between Acid and Acidic
• pH is a scale that tells how acidic or alkaline a substance is. The value of pH ranges from -7 to +7.
• Pure water has a pH value of zero indicating its neutrality.
• Acids are substances having pH lower than zero while alkaline substances have positive values on this scale
• We should eat more of foods that increase the pH value inside the body which means that we should eat more alkaline foods.