When performing a flame test using the method described in the manual, you complete the flame test of potassium nitrate and find a yellow-orange color instead of the expected purple color. Select the potential sources of error.
O The nichrome wire is dirty.
O The watch glass is dirty.
O The solution is contaminated.
O The flame is not optimized.
O The solution is not concentrated enough.
O The nichrome wire is not hot enough.