Question

makeup: flame test lab
look at the data. predict what flame color of the solution $k_{2}(co_{3})$.
flame test data table

#	substance	formula	flame color
2	strontium nitrate	$sr(no_{3})_{2}$	red
3	copper ii sulfate	$cuso_{4}$	green
4	sodium carbonate	$na_{2}co_{3}$	orange
5	potassium nitrate	$kno_{3}$	purple
6	strontium chloride	$srcl_{2}$	red
7	sodium nitrate	$nano_{3}$	orange
8	copper ii nitrate	$cu(no_{3})_{2}$	green
9	potassium sulfate	$k_{2}so_{4}$	purple
10	copper ii chloride	$cucl_{2}$	green
11	sodium chloride	nacl	orange

solutions sorted by color

orange	green	purple	red
$nano_{3}$	$cucl_{2}$	$kno_{3}$

Explanation:

Step1: Identify the cation in $K_2(CO_3)$

The cation is potassium ($K^+$).

Step2: Look for potassium - containing compounds in the data

Potassium - containing compounds like $KCl$, $KNO_3$, $K_2SO_4$ all produce a purple flame color in the flame test.

Answer:

Purple