Assuming equal concentrations , rank these solutions by pH. RbOH(aq), NH3(aq), HF(aq) HBr(aq), Ca(OH)2(aq).
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To rank these solutions by pH, we need to compare their acidity or basicity. The pH scale ranges from 0 to 14, with solutions having a pH less than 7 considered acidic, solutions with a pH equal to 7 considered neutral, and solutions with a pH greater than 7 considered basic.
Let's start by analyzing each compound:
1. RbOH(aq) - This compound is rubidium hydroxide, an alkali metal hydroxide. It is a strong base, so it will have a high pH. The hydroxide ion (OH-) is a strong base that accepts protons (H+) from water molecules, increasing the concentration of hydroxide ions and making the solution basic.
2. NH3(aq) - This compound is ammonia, a weak base. It ionizes in water to form ammonium ions (NH4+) and hydroxide ions (OH-). However, ammonia does not fully ionize, so the concentration of hydroxide ions is lower compared to strong bases. It is less basic compared to RbOH(aq), so it will have a lower pH.
3. HF(aq) - This compound is hydrofluoric acid, a weak acid. It ionizes in water to form hydronium ions (H3O+) and fluoride ions (F-). Similar to weak bases, weak acids do not fully ionize, resulting in a lower concentration of hydronium ions. It is less acidic compared to strong acids, so it will have a higher pH.
4. HBr(aq) - This compound is hydrobromic acid, a strong acid. It ionizes completely in water to form hydronium ions (H3O+) and bromide ions (Br-). Being a strong acid, it has a high concentration of hydronium ions, making the solution highly acidic and resulting in a lower pH.
5. Ca(OH)2(aq) - This compound is calcium hydroxide, an alkali earth metal hydroxide. Similar to RbOH(aq), it is a strong base. It fully ionizes in water to form calcium ions (Ca2+) and hydroxide ions (OH-), resulting in a high concentration of hydroxide ions. Therefore, the pH will be high.
Based on this analysis, we can rank the solutions by pH as follows:
Most basic: RbOH(aq) > Ca(OH)2(aq) > NH3(aq) > HF(aq) > HBr(aq) : Most acidic