1 Katilar

How Useful Are Acids And Alkalis Essay

Acids, Bases And P H Scales Essay

What is an acid and a base?

The first person that tried to define acids and bases was Arrhenius. His theory proposed that an acid is any substance that produces a proton H+, when dissolved in water and the resulting solution is an electrolyte. A base is any substance that produces hydroxide ions, when dissolved in water; they are also called alkali. This theory was able to explain the way acids and bases react; the only substance that the theory was not able to explain was NH3. So the definition of an acid and a base was redefined, and the Brønsted-Lowry Theory was created. This theory stated that an acid will donate a proton H+ and a base will accept one; it also claimed that an acid or a base will never be a base or an acid until they are dissolved in the water.

Although no theory has been accepted as a law to explain the way acids and bases react, the Brønsted-Lowry theory is the most accepted one.

Properties of acids and bases.

Some of the properties of the acids and bases are:

-Acids taste sour and bases taste bitter.

-Acids turn blue litmus to red; bases turn red litmus to blue.

-In a neutralization reaction, acids neutralize bases; and bases neutralize acids.

-Acids release a hydrogen ion into aqueous solution and bases release a hydroxide ion.

-The hydrogen ion of the acid and the hydroxide ion of the base unite to form water.

-An acid plus a base makes water plus a salt.

-When acids react with carbonates, carbon dioxide is formed; when a base reacts with a carbonate no reaction takes place.

-When acids react with ammonium chloride, no reaction takes place; when a base reacts with ammonium chloride, ammonia is produced.

What is a Chemical...

Loading: Checking Spelling

0%

Read more

Effect of Acids and Bases Essay

866 words - 3 pages Effect of Acids and Bases Experiments to Determine the Effect of Acids & Bases on Different Indicators and the pH of Common Cleaning Agents The aim of the first set of experiments is to find out and record the colour changes that are observed after a certain indicator is mixed with acids and bases to form a colour reaction. Once the selected indicator has been mixed with a acid that is both weak and strong and a base/alkali that is both...

Acids, Bases and Natural Indicators Essay

1361 words - 5 pages INTRODUCTION:Nowadys, indicators have become technologically advanced and can be used for the main purpose of indicating whether something is acidic, basic or neutral. This is possible because in solutions of different pH, the colour of the inidcator will change simultaneously with pH change. This is made possible by pigments in the indicators....

PH and Health Problems

535 words - 2 pages 1. Heartburn is a burning sensation behind the breastbone. Unlike the name says heartburn has absolutely nothing to do with the heart. It is problem caused by the digestive system. The main type of heartburn is called Angina. It is caused by temporary shortage of oxygen being carried in the blood to the heart muscle. Heartburn occurs when small amounts of...

Carbon Dioxide content of softdrinks

605 words - 2 pages 1.0Theory1.1Acids and basesAn acid is any chemical compound that, when dissolved in water, gives a solution with a pH less than 7.0. It is also a compound which donates a hydrogen ion (H+) to another compound (called a base).Generally, acids have the following properties:•Taste: Acids generally have a sour taste•Touch: Strong or concentrated acids often produce a...

Acid-Base Chemistry Lab

1416 words - 6 pages The purpose of this lab was to determine the pH and total acidity of grape juice and wine. A second purpose was to experimentally determine the pKa of a monoprotic weak acid, polyprotic weak acid, as well as, a free amino acid, alanine. Acids and bases were defined by Bronsted-Lowry in 1923, in which acids were described as substances capable of donating a proton and bases are substances capable of accepting a proton...

Acid

507 words - 2 pages Acid comes from the Latin word acere, which means sour. In dilute concentrations acids are responsible for the sour taste of lemons, limes, vinegar and other substances. Hydrochloric acid is produced in your stomach to help digest food. Sulfuric acid is found in car batteries. Acids can conduct an electric current. Acids are also corrosive. When acids react with metals they form hydrogen gas. When an acid reacts with a carbonate it forms...

Acid/Base Chemistry

1400 words - 6 pages Yeast produce beverages that Americans twenty-one or older enjoy, they make drinks like beer, wine, and etc. One of the most widely seen genus and species is Saccharomycescerevisiae (winemakermag.com). There are many different strands of this organism. But this particular yest genus is so useful that one company seems that they only work with it, Vinters Harvest provides these organisms to home brewers and theirmain yeast is this one. Yeast...

Determining the Influence of pH on the Activity of Catalase Enzyme in Potato Tuber Cells

2302 words - 9 pages INTRODUCTIONEnzymes are vitally important for every living organism, because without them the reactions within the cells would occur to slow to sustain life. However there are many factors which affect the rate of enzymes reactions. One of them is pH, which influence on the enzyme activity will be the subject of this investigation. Catalase of potato tuber cells will be the enzyme used in the experiment.RESEARCH QUESTIONWhat is the...

Lab: Exploring Organelle Function

716 words - 3 pages ABSTRACT:An enzyme is a protein which functions as an organic catalyst, which allows a particular reaction to occur without using itself up in the process. Without enzymes, most reactions in a cell would not occur. Enzymes function best in an acidic environment as do catalase, however the correct concentration of an acidic solution is needed to ensure the most efficient reaction. Placing a catalase enzyme into a solution which is...

Potentiometeric Titrations

1640 words - 7 pages Title: Potentiometric Titration Purpose: The purpose of this lab was to construct a titration curve by titrating Formic acid using a standardized sodium hydroxide (NaOH) and a pH meter through potentiometric titration. After the data for the rest of the class is collected, compare and contrast the equivalence points to see how the concentrations of the various acids affected the acids weakness and strength. Methods: Obtain 0.020 M...

Essay & Research Project #2

1019 words - 4 pages Describe the properties of acids with regard to their reactions with metals, bases and carbonates.Acids taste sour, conducts electricity and has a pH lower than 7. Therefore, it turns red if universal indicator is added and turns blue litmus paper red. Strong acids with a pH of 1 or 2, contain more hydrogen ions and are very corrosive while weak acids with a pH of 5 or 6 contain less hydrogen ions therefore, they are not that...

Acids and bases are chemical substances that release ions when dissolved in water. Acids are compounds that release positive hydrogen ions in water. Bases release hydroxide ions, which are compounds made of an oxygen and a hydrogen. Acids and bases are used around the house for cleaning, but the levels of acids and bases in the body are also important. The body needs a neutral pH and controls the amounts of acids and bases through processes involving the kidneys, lungs and blood.

Video of the Day

Acids and bases function to balance the pH levels in the body. Acids and bases are found in foods, the environment and in chemicals including pharmaceuticals. The pH levels in the blood are required to stay neutral, which is at a level of 7. When a dieter eats acidic foods, the body uses a buffering system to neutralize the positive ions released from the acids. Conversely, bases are also controlled to keep the body from becoming too alkaline.

pH is used to measure the amount of hydrogen protons in a substance and the strength of an acid. Strong acids are used in laboratories and cleaning solutions. A strong acid releases more ions in water than a weaker acid, giving it a low pH level. A small pH number means more ions are dissolved in the solution. A higher pH number means the solution is more basic, and fewer hydrogen protons are available in the fluid. Because strong acids and bases are dangerous, most household items are diluted. A pH of 2 is a strong acid, and it is the approximate pH level found in the stomach. The stomach acid helps the breakdown of foods in the body for absorption in the intestines.

Acids and bases have different physical properties. One property of acids is a sour taste (although laboratory chemicals shouldn't be tasted). Foods such as citrus fruits have acidic properties. Vinegar is acetic acid, and it is also sour. Acids are also corrosive and change litmus paper to red.

A property of bases is that the chemicals feel slippery. Household bleach is a common base. Bases also turn litmus paper blue.

Changes in pH in the body lead to physical changes. When your body has too much carbon dioxide, the blood becomes too acidic. Breathing is slowed to increase the pH in the blood. Conversely, if pH in the body is too alkaline, you will hyperventilate in an attempt to lower the pH. This acid and base control is an important part of biological homeostasis in humans.

The body also has a buffer system that helps control the level of acids and bases. pH levels are controlled using bicarbonate or HCO3-. The metabolism in the human body produces high amounts of acids. For example, when working out and building muscles, your muscle tissue produces lactic acid; this acid is picked up and neutralized by the bicarbonate ion.

Lose Weight. Feel Great! Change your life with MyPlate by LIVESTRONG.COM

Leave a Comment

(0 Comments)

Your email address will not be published. Required fields are marked *