Physical. But overall salt dissolving in water is what the question is asking not if ions react with water. It is not a chemical change because no new chemical bonds are formed. The MCAT (Medical College Admission Test) is offered by the AAMC and is a required exam for admission to medical schools in the USA and Canada. And strong acids and bases are considered dissociated in water. When the NaCl dissolves, the Na and Cl ions do break apart. Spell. I have a computer science, microbiology, and physics background. When it dissolves in water, it produces positive hydrogen ions and negative chloride ions (Cl-). Thus, any ionic compound that is soluble in water would experience a chemical change. The ions display different properties from the original compound. How do you find density in the ideal gas law. What are the units used for the ideal gas law? This can be represented by the chemical equation: HCl → H 2 O H + + Cl-A base is a compound that produces negative hydroxide ions (OH-) and positive metal ions when it dissolves in water. It is a physical change. No new chemical bonds are breaking or forming. The reactant (sodium chloride or NaCl) differs from the products (sodium and chloride ions), so a chemical change occurs. The reactant (sodium chloride, or NaCl) is different from the products (sodium cation and chlorine anion). Press J to jump to the feed. Because, it's a reversible process. In contrast, dissolving a covalent compound like sugar does not result in a chemical … Match. Identify the following as physical (P) or chemical (C) changes. It is not a chemical change because no new chemical bonds are formed. bonds being made and broken) it's a physical change.I just always ask myself "Is the compound being changed into another compound?" To generalize: Dissolving an ionic compound is a chemical change. The #1 social media platform for MCAT advice. So, the attractive electrostatic forces between ions are weakened by a factor of 80 when salt is added to water. P 3. However, there's a dispute about whether dissolving an ionic compound (like salt) is a chemical or physical change because a chemical reaction does occur, where the salt breaks into its component ions (sodium and chloride) in water. NaCl dissolves in water is a. - if no, then physical change. That indicates a chemical change. https://chemistry.stackexchange.com/questions/87314/is-dissolving-salt-a-chemical-reaction-or-a-physical-change. Chemical. Now as far as i am concerned dissolving salt is a chemical change, the ionic bonds between Sodium and Chlorine ions have broken and the ions are free to move around in the water. An apple is cut. 1 Answer. Ag tarnishs. Is sodium chloride dissolving a chemical change? While the salivation of salt is technically a chemical reaction ( NaCl + H2O —> NaOH + HCl) the reaction is negligible because everything is in an aqueous soliton. Why Dissolving Salt Is a Chemical Change Therefore, dissolving salt in water is a chemical change. The reactant (sodium chloride, or NaCl) is different from the products (sodium cation and chlorine anion). It … This nonstop attack continuous until the whole NaCl crystal disintegrates. So I think on the whole it's best to think of it as a physical process that is right on the line of a chemical process. If the actual compound's makeup isn't altered (chemical reaction occuring i.e. I'll note that the Chemistry authors quite intentionally omit classifying whether dissolution of magnesium sulfate in water is a chemical or physical process in their discussion of endo- versus exothermic processes, as ionic solids (especially of elemental compounds) are a pretty clear grey area for a number of chemical-versus-physical topics. It is the polar nature of water that allows ionic compounds to dissolve in it. This tells us that hydrochloric acid and sodium hydroxide never form spontaneously from sodium and chloride in aqueous solution. The reactant (sodium chloride, or NaCl) is different from the products (sodium cation and chlorine anion). To understand this process at the molecular level, we must apply the three steps we previously discussed. Physical change: You’ve always heard that the difference is a chemical reaction occurs in chemical changes. ... What is a physical property. How do you calculate the ideal gas law constant? When the NaCl dissolves, the Na and Cl ions do break apart. If water evaporates, you get back the salt. These substances constitute an important class of compounds called electrolytes. This is consistent with 3 older chem books I have lying around and 2 others on my old college laptop. Your one professor probably said this is a chemical reaction therefore a chemical change and is technically right. When we make changes to materials by dissolving them in water we can sometimes reverse the change. The dielectric constant $\epsilon_r$ of water is 80 compared with 1 for air.