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In Chemistry / College | 2025-07-03

Identify the substances that are likely to dissociate in water. Check all that apply.

* sodium bromide ([tex]$NaBr$[/tex])
* potassium hydroxide ([tex]$KOH$[/tex])
* magnesium chloride ([tex]$MgCl_2$[/tex])
* silicon dioxide ([tex]$SiO_2$[/tex])
* sodium oxide ([tex]$Na_2O$[/tex])

Asked by eleanorn9999

Answer (2)

Sodium bromide (NaBr), potassium hydroxide (KOH), magnesium chloride (MgCl2), and sodium oxide (Na2O) are identified as substances likely to dissociate in water.
NaBr and MgCl2 are ionic compounds that dissociate.
KOH is a strong base that dissociates.
Na2O reacts with water to form NaOH, a strong base, and thus effectively dissociates.
The substances that dissociate in water are: NaBr, KOH, MgCl2, Na2O. N a B r , K O H , M g C l 2 ​ , N a 2 ​ O ​

Explanation

Analyzing the Substances We need to identify which of the given substances are likely to dissociate in water. Dissociation in water typically occurs with ionic compounds, strong acids, and strong bases. Let's analyze each substance:

Sodium Bromide (NaBr) Sodium bromide (NaBr): This is an ionic compound formed from sodium (Na) and bromine (Br). Ionic compounds generally dissociate in water.

Potassium Hydroxide (KOH) Potassium hydroxide (KOH): This is a strong base. Strong bases dissociate completely in water.

Magnesium Chloride (MgCl2) Magnesium chloride (MgCl2): This is an ionic compound formed from magnesium (Mg) and chlorine (Cl). Ionic compounds generally dissociate in water.

Silicon Dioxide (SiO2) Silicon dioxide (SiO2): This is a covalent network solid, also known as silica or quartz. It does not dissociate in water.

Sodium Oxide (Na2O) Sodium oxide (Na2O): This is an ionic compound. It reacts with water to form sodium hydroxide (NaOH), which is a strong base and dissociates in water. Therefore, Na2O is likely to dissociate by reacting with water to form ions.

Conclusion Based on the analysis, the substances likely to dissociate in water are sodium bromide (NaBr), potassium hydroxide (KOH), magnesium chloride (MgCl2), and sodium oxide (Na2O).


Examples
Understanding which substances dissociate in water is crucial in various real-life applications. For example, in water treatment, knowing how different chemicals dissolve helps in designing effective purification processes. In agriculture, understanding the dissociation of fertilizers helps in optimizing nutrient uptake by plants. In medicine, the dissociation of drugs in the body affects their absorption and efficacy. This knowledge is also essential in environmental science for predicting the behavior of pollutants in aquatic ecosystems.

Answered by GinnyAnswer | 2025-07-03

The substances that likely dissociate in water are sodium bromide (NaBr), potassium hydroxide (KOH), magnesium chloride (MgCl2), and sodium oxide (Na2O). Silicon dioxide (SiO2) does not dissociate in water. Therefore, the correct choices are NaBr, KOH, MgCl2, and Na2O.
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Answered by Anonymous | 2025-07-04

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