1) What is/are the spectator ion(s) of the following chemical reaction? NaOH(aq)
ID: 532270 • Letter: 1
Question
1) What is/are the spectator ion(s) of the following chemical reaction?
NaOH(aq) + CH3COOH(aq) --> NaCH3COO(aq) + H2O(l)
2)A beaker of NaOH solution is mixed with another beaker of CuCl2 solution. If there is a chemical reaction occurring, what is the driving force for the chemical reaction?
3)Predict products of the following reaction:
Cl2 + KI -->
4)What is the oxidizing agent of the following reaction?
NaBr + Cl2 --> NaCl + Br2
5)When colorless K2CO3 solution is mixed with colorless HCl solution, what will happen?
6)In Vinegar Analysis lab, the end point is reached when the final drop of NaOH makes the mixture basic, which turn the pH indicator pink. However, if we put the flask on the bench long enough, the pink color may eventually disappear due to some substance from the air. What substance from air is causing the pink color of pH indicator to disappear?
A) OH- ionExplanation / Answer
For the given acid base neutralization reaction,
NaOH(aq) + CH3COOH(aq) --> NaCH3COO(aq) + H2O(l)
The ions present in the aqueous solution, before the reaction are
Na+, CH3COO-, H+ and OH-.
Before the reaction are (during reaction H+ and OH- combined to form water)
Na+ and CH3COO-
Thus Na+ and CH3COO- are the spectator ions of the above reaction.
Thus solubility will be negligible.
Thus above reaction is an example of precipitation reaction.
2KI + Cl2 2KCl + I2
Products produced are potassium chloride and iodine.
This reaction is called single replacement reaction. Cl is more electronegative than I
Thus Cl replace iodine from the potassium iodide
Option B is correct.
2NaBr + Cl2 --> 2NaCl + Br2
If are adding the oxidation state of each element as super script
2Na+1Br -1+ Cl20 --> 2Na+1Cl-1 + Br20
Oxidation number of sodium didn’t change.
The oxidation number of Br -1 changed to 0 (-1 to 0). That is Br got oxidized.
The oxidation number of Cl changed to from 0 to -1. That is Cl got reduced.
(Note: if the oxidation number of an element is increasing it can be considered as oxidized. If it got decreased it can be considered as reduced)
The oxidizing agent is the element which got reduced or the element which helps the oxidation of another element.
In the present case, chlorine got reduced and it is the oxidizing agent.
As per the policy of Chegg, one question or 4 sub-parts are answered.
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