What Is H2so3 – Presentation on theme: “Which of the following is sulfuric acid? A. H2SO4, B. H2SO3, C. H2S”— Presentation transcript:
Question: Which of the following is sulfuric acid? A. H2SO4, B. H2SO3, C. H2S Acids produce H+ when dissolved in water. H2SO4 2 H+ + SO42- H2SO3 2 H+ + SO32- H2S 2 H+ + S2- The name of an acid is related to the name of the anion produced after the hydrogen ions are removed. Which of the following is sulfuric acid? A. H2SO4, B. H2SO3, C. H2S PAUSE CLICK Acids are compounds that produce hydrogen ions in water. For example, click for the acid given in option A, …H2SO4, …. 2 Highlight 2 H+ Hydrogen ions can be dissociated from the molecule when the compound is placed in water. When the 2 hydrogen ions are dissociated, what is left is the sulfate ion…. with a charge of SO4 -2. CALLOUT “Sulfite” pointing to SO42 – Similarly, H2SO3 has 2 hydrogen atoms that can dissociate as hydrogen ions, leaving one sulfite ion, … SO3 CALLOUT “Sulfite” pointing to SO32 with a charge DOES- CLICK AND, H2S HAS 2 HYDROGEN ATOMS LEAVING A SULPHIDE ION, CAN DISSOCIATE AS HYDROGEN IONS, … SO3 -2 CALLOUT POINTS TO S2- PAUSE WITH THE CHARGE OF “SULFIDE” A The name of the acid is related to the name of the anion produced when the hydrogen ions are removed. . Click Continue to the next slide
What Is H2so3
If the name of the acid is hydro—-ic acid, the name of the anion left behind when the H+ ions are removed ends in ide. Example: Hydrochloric acid produces hydrogen and chloride ions because chloride is Cl-, hydrochloric acid is HCl. becomes Example: Carbonic acid produces hydrogen and carbonate ions because carbonate is CO32-, carbonic acid is H2CO3 If the name of the acid is —–ous acid, then the name of the anion left behind when the H+ ions are removed is in ite ends . Example: Hypochlorous acid produces hydrogen and hypochlorite ions. Because hypochlorous acid is ClO-, hypochlorous acid is HClO. In general, if the acid’s name begins with hydrohalite and ends in IC acid, the H+ ions are removed. Highlight the name of the anion left behind on departure. ends in ide. For example, when hydrogen ions are separated from hydrochloric acid, the anion left behind is chloride. Since chloride is Cl with a -1 charge, a hydrogen ion must be dissociated from hydrochloric acid to produce a chloride ion. So the formula of hydrochloric acid is HCl. If the acid’s name does not begin with hydrogen, but ends in IC acid, then the name of the anion left behind when the H+ ions are removed is eliminated. For example, carbonic acid does not begin with a hydrocarbon, the “no hydro” callout but ends in IC acid. Therefore, the anion left behind on dissociation of hydrogen ions from carbonic acid is carbonate. Carbonate is CO3 with a -2 charge. The -2 charge means that the molecule it came from must have produced two hydrogen ions. So the formula of carbonic acid is H2CO3. Finally, if the acid’s name ends in ous acid, mark the acid, then the name of the anion left behind when the H+ ions are removed ends in ite. Labeling ite hypochlorous acid therefore dissociates into hydrogen and hypochlorite ions. Hypochlorite is ClO with -1 charge. The -1 charge means that the molecule it came from must have produced a hydrogen ion. So the formula of hypochlorous acid is HClO Click on the next slide
Chemical Forums: Acid Dissociation
3 Question: Which of the following formulas for sulfuric acid is correct? A. H2SO4, B. H2SO3, C. H2S The “us” in sulfuric acid means that the remaining anion is sulfite when the H+ ions are removed. Sulfite is SO32- Sulfuric acid is H2SO3 Removing all the H+ from H2SO4 gives us SO42-, or sulfate. Therefore, H2SO4 is sulfuric acid. Removing all the H+ from H2S gives us S2-, or sulfide. Therefore, H2S is hydrosulfuric acid. Click The “us” in sulfuric acid means that the anion left behind when the hydrogen ions leave the molecule is sulfite. Click The formula for sulfites is SO3 with a charge of -2. Since a sulfuric acid molecule is neutral, the molecule must have lost 2 hydrogen ions. The charge of two hydrogen ions in the sulfite formula adds up to 2 times (+1) highlight and one sulfide ion adds up to -2 zero. So the formula of sulfuric acid is H2SO3. The correct answer is option B. Let’s consider options A and C. Click If we remove two hydrogen ions from H2SO4, we end up with SO4 with a -2 charge. SO4 with -2 charge is called sulfate. Therefore, H2SO4 is sulfuric acid. What about choice C? If we remove two hydrogen ions from H2S, we end up with S with a -2 charge. S with -2 charge is sulfide. Therefore, H2S is hydrosulfuric acid.
4 Video ID: © 2008, Project Value (Video Assessment Library for Undergraduate Education), Nicholls State University Department of Natural Sciences Author: Glenn V. Low Narrator: Louisiana Board of Regents Contract No. LA-DL-SELECT-13- 07/08
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