Question

you will then determine the chemical responsible for the flame color.
flame test data table

substance formula flame color

1 potassium chloride kcl purple
2 strontium nitrate sr(no₃)₂ red
3 copper ii sulfate cuso₄ green
4 sodium carbonate na₂co₃ orange
5 potassium nitrate kno₃ purple
6 strontium chloride srcl₂ red
7 sodium nitrate nano₃ orange
8 copper ii nitrate cu(no₃)₂ green
9 potassium sulfate k₂so₄ purple
10 copper ii chloride cucl₂ green
11 sodium chloride nacl orange
solutions sorted by color
orange green purple red
na₂co₃ cuso₄ kcl sr(no₃)₂
nano₃ cucl₂ kno₃
what element is responsible for the flame color? cu, k, na, or sr?

Explanation:

Step1: Analyze orange - colored flames

Orange - colored substances are sodium carbonate ($Na_2CO_3$), sodium nitrate ($NaNO_3$) and sodium chloride ($NaCl$). The common element is sodium ($Na$).

Step2: Analyze green - colored flames

Green - colored substances are copper(II) sulfate ($CuSO_4$), copper(II) chloride ($CuCl_2$) and copper(II) nitrate ($Cu(NO_3)_2$). The common element is copper ($Cu$).

Step3: Analyze purple - colored flames

Purple - colored substances are potassium chloride ($KCl$), potassium nitrate ($KNO_3$) and potassium sulfate ($K_2SO_4$). The common element is potassium ($K$).

Step4: Analyze red - colored flames

Red - colored substances are strontium nitrate ($Sr(NO_3)_2$) and strontium chloride ($SrCl_2$). The common element is strontium ($Sr$).

Answer:

Orange: $Na$; Green: $Cu$; Purple: $K$; Red: $Sr$