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.
Thanks :)
Also what would the pH value for grapefruit juice be? (>7, 7, or <7)
http://www.jiskha.com/display.cgi?id=1395270068
grapefruit juice is considered acidic. So the question becomes what part of the pH scale is acidic?
Less than 7 is acidic.
1. Water is considered neutral in terms of ion count because it has an equal number of H+ (hydrogen) ions and OH- (hydroxide) ions. In pure water, a small fraction of water molecules naturally dissociate into these ions. For every H+ ion formed, an OH- ion is also formed, resulting in a balance of positive and negative charges. This is why water is said to have a neutral pH of 7.
2. a) When HI (hydroiodic acid) is added to water, it ionizes to produce H+ ions. This reaction can be represented as:
HI + H2O -> H3O+ + I-
In this case, the number of H+ ions increases, while the number of OH- ions remains the same. So, the concentration of H+ ions will be higher than the concentration of OH- ions.
b) When KBr (potassium bromide) is added to water, it dissociates into K+ and Br- ions. However, neither of these ions significantly affects the concentration of H+ or OH- ions in water. Therefore, the number of H+ and OH- ions remains the same, and the water remains neutral.
c) When KOH (potassium hydroxide) is added to water, it dissociates into K+ and OH- ions. In this case, the number of OH- ions increases, while the number of H+ ions remains the same. Consequently, the concentration of OH- ions will be higher than the concentration of H+ ions, making the solution basic.
3. The Arrhenius definition for salts describes them as compounds that, when dissolved in water, produce cations (positive ions) and anions (negative ions). These ions are responsible for the conducting properties of salts in aqueous solutions. For example, when table salt (sodium chloride, NaCl) is dissolved in water, it dissociates into Na+ and Cl- ions. So, according to the Arrhenius definition, sodium chloride is classified as a salt.