What is the arrow pointing to?

Part A What is the arrow pointing to? O electron hydroxide ion O water molecule O hydronium ion hydrogen ion Submit Part B What is the arrow pointing to? hydrogen ion hydroxide ion water hydronium ion proton


Each water molecule is made up of two hydrogen atoms and one oxygen atom. Oxygen is large and marked by red color and hydrogen is a small atom marked by grey color. A water molecule can dissociate into hydrogen ion (H+) and hydroxide ion (OH-). H2O –> H+ + OH- The H+ ion when combines with another water molecule a hydronium ion (H3O+) is formed. H+ + H2O –> H3O+ Part A The correct option is hydrogen ion, as only single hydrogen atom with the positive charge is shown Part B The correct option is hydroxide ion, as the arrow shows a molecule with an oxygen atom and a hydrogen atom with a negative charge on it. Part C The correct option is Hydrogen ion concentration is equal to hydroxide ion. Each water molecule dissociates into a hydrogen ion and a hydroxide ion. Water is a neutral solution since the two charges balance each other. If hydrogen ion is more than the solution is acidic and vice-versa. Part-D

The correct option is the right solution is basic as compared to the solution in the right. The right side solution shows a lot of Hydrogen ions and neutral water molecules, indicating that hydrogen ions are in excess than hydroxide ions. It implies that the solution is acidic. The solution on the left shows an excess of hydroxide ions as compared to neutral water molecules. This indicates that the solution in the right has an excess of hydroxide ion, thus, it is basic.

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