Sodium Na+ Intense yellow

Barium Ba++ Green
Calcium Ca++ Brick red
Copper Cu+ or Cu++ Blue-green
Strontium Sr++ ?
Lithium Li+ ?
Sodium and potassium mixture Na+&K :yellow light
Observations using the cobalt glass filter
Sodium & potassium mixture Na+&K+:reddish color
Potassium K+ Violet light
please check for me !!

They look ok to me. Sr is red and Li is crimson.

thank you

From the given information, we can determine the colors produced by different ions when they are placed in a flame. Here are the observations:

1. Sodium (Na+): Intense yellow light
2. Barium (Ba++): Green light
3. Calcium (Ca++): Brick red light
4. Copper (Cu+ or Cu++): Blue-green light
5. Strontium (Sr++): Unknown/color not provided
6. Lithium (Li+): Unknown/color not provided
7. Sodium and potassium mixture (Na+&K): Yellow light
8. Sodium and potassium mixture (Na+&K) with cobalt glass filter: Reddish color
9. Potassium (K+): Violet light

Based on the information given, the colors observed for strontium (Sr++) and lithium (Li+) ions are not provided. So, we cannot determine the exact color produced by strontium and lithium ions.

However, it is important to note that these observations are based on a specific set of conditions, such as the use of a flame and cobalt glass filter. Different conditions may result in variations in the observed colors.