Theories of acids and bases In fact, the reaction between HCl and water is reversible, but only to a very minor extent. In order to generalise, consider an acid HA, and think of the reaction as being reversible. Thinking about the forward reaction: The HA is an acid because it is donating a proton (hydrogen ion) to the water. The water is a base because it is accepting a proton from the HA. But there is also a back reaction between the hydroxonium ion and the A- ion: The H3O+ is an acid because it is donating a proton (hydrogen ion) to the A- ion. The reversible reaction contains two acids and two bases. When the acid, HA, loses a proton it forms a base, A-. Members of a conjugate pair differ from each other by the presence or absence of the transferable hydrogen ion. If you are thinking about HA as the acid, then A- is its conjugate base. If you are thinking about A- as the base, then HA is its conjugate acid. The water and the hydroxonium ion are also a conjugate pair. A second example of conjugate pairs
25 Strangest Geological Formations On Earth Top 10 Amazing Chemistry Videos - Wired Science Fiery explosions, beautiful reactions, and hilarious music videos are great reasons to be excited about chemistry. Here are some of our favorites. 10. Thermite vs. Liquid Nitrogen The British science show Brainiac asked one of the greatest scientific questions of all time: can liquid nitrogen freeze molten iron? 9. 8. 7. 6. 5. 4. 3. 2. 1. If you have not had enough yet, check out the brilliant collection of Edward Kent.
Practical Chemistry This website is for teachers of chemistry in schools and colleges. It is a collection of experiments that demonstrate a wide range of chemical concepts and processes. Some of the experiments can be used as starting-points for investigations or for enhancement activities. Many have links to carefully selected further reading and all include information and guidance for technicians. Chemistry is a practical science. We have published a new set of resources to support the teaching of practical science for Key Stages 3-5.
Acid vs Base Bases are the chemical opposite of acids. Acids are defined as compounds that donate a hydrogen ion (H+) to another compound (called a base). Traditionally, an acid (from the Latin acidus or acere meaning sour) was any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion activity greater than in pure water, i.e. a pH less than 7.0. A soluble base is also called an alkali. Properties of acids vs bases Bases have a slippery feel on fingers and taste bitter. Litmus Test and Other Reactions Litmus paper is made from dyes derived from lichens; it is water-soluble, meaning it can be fully dissolved in water. Strong acids have a corrosive effect on metals. Differences in Applications for acids and bases Acids are often used to remove rust from metals, as an electrolyte in batteries, for mineral processing, to produce fertilizers and gasoline and as additives in food and beverages. Types & Examples of Acids and Bases References Share this comparison:
Terrific Mini Guide to Help Students Think Critically December 26, 2014 Questioning is the key to critical thinking and through questions students get to explore the deep layers of meanings that would otherwise go unnoticed. Of course not all questions have this analytical ability. For instance, closed questions tend to limit the thinking choices available for students. The same with questions that promote factual recalling. Questions that emphasize the mechanical on the analytical are out of the list. In today's post, I am sharing with you this mini guide created by Foundation of Critical Thinking which you can use with your students to help them better comprehend and apply critical thinking in their learning. I learned about this great resource from a post shared by Education to Save The World. Image credit: Foundation of Critical Thinking
Welcome to the Chemical Education Digital Library Acid/Base Basics For instance, 30 mL of 1.00 M NaOH is needed to titrate 60 mL of an HCl solution. The concentration of HCl needs to be determined. At the eqivalence point: To solve for the molarity of HCl, plug in the given data into the equation above. The concentration of HCl is 0.5 M. Sample Problems 1. CaSO4 NaCl HNO3 NH3 Solution: There are 6 strong acids and all other acids are considered weak. The answer is (c) HNO3. 2. HCl HPO42- H3PO4 NH4+ CH3NH3+ Solution: A Brønsted-Lowry Base is a proton acceptor, which means it will take in an H+. Here, it is clear that HPO42- is the acid since it donates a proton to water to make H3O+ and PO43-. In this case, HPO42- is the base since it accepts a proton from water to form H2PO4- and OH-. Since HPO42- is the only compound from the options that can act as a base, the answer is (b) HPO42-. 3. Solution: Since the number of moles of acid equals the number of moles of base at neutralization, the following equation is used to solve for the molarity of HCl: MHCl = 1 M 4.