1. with respect to ion count, why is water considered to be neutral?
2. How do the number of H+ and OH- ions compare after
a.) HI is added to water?
b.)KBr is added to water?
c.)KOH is added to water?
3. Give the Arrhenius definitions for salts.
ALL compounds are neutral. I don't understand what you mean by ion count; water has no ions other than the small concns of H^+ and OH^-. Both of those are 1E-7 M in pure H2O; perhaps that's what you mean by ion count but those exactly neutralize each other and the count is equal.
2.
a. If HI is added to water you increase the H^+, decrease the OH^-, and increase I^-
b. KBr added to H2O has to effect on H^+ or OH^-
c. KOH added to water increases OH^-, decreases H^+, and increases K^+.
3. I'm not sure I ever learned a definition of an Arrhenius salt. I believe if it wasn't an Arrhenius acid and not an Arrhenius base, it was a salt. I remember in freshman chem I was told a salt (and we studied Arrhenius acids and bases and no other kind then) was the combination of a cation (other than H^+) and an anion (other than OH^-)
d.
You are a lifesaver! Thank u so much !
1. Water is considered to be neutral with respect to ion count because it is made up of equal numbers of hydrogen ions (H+) and hydroxide ions (OH-). In pure water, the concentrations of H+ ions and OH- ions are equal, resulting in a neutral pH of 7. This balance of H+ and OH- ions is what makes water neither acidic nor basic.
2. a) When HI (hydroiodic acid) is added to water, it dissociates into H+ ions and I- ions. The H+ ions increase the concentration of acidic ions in the water, while the OH- ions remain relatively unchanged. As a result, the number of H+ ions increases and the number of OH- ions remains the same, making the solution more acidic.
b) When KBr (potassium bromide) is added to water, it dissociates into K+ ions and Br- ions. Neither of these ions significantly affects the concentration of H+ or OH- ions in the water. Therefore, the number of H+ ions and OH- ions remains relatively unchanged, and the solution remains neutral.
c) When KOH (potassium hydroxide) is added to water, it dissociates into K+ ions and OH- ions. The OH- ions increase the concentration of basic ions in the water, while the H+ ions remain relatively unchanged. Consequently, the number of OH- ions increases, and the number of H+ ions remains the same, making the solution more basic.
3. According to the Arrhenius definition, salts are compounds that dissociate in water to produce positive metal ions (cations) and negative non-metal ions (anions). These ions are responsible for conducting electricity in aqueous solutions. For example, when sodium chloride (NaCl) is dissolved in water, it dissociates into sodium cations (Na+) and chloride anions (Cl-), allowing the solution to conduct electricity. This definition focuses on the behavior of salts in aqueous solutions and their ability to produce ions.