This is true, depending on the color, there should be a chart where you can compare the color of the litmus paper (dipped in acid/base) to figure out how basic or acidic it is
Mixture because your pouring something into it then stirring it i don’t know.
It's about .0934 Liters at STP.
If an electron moves up from the first orbit to the higher energy levels, energy will be absorbed by the electron itself and no emission line produced.
But if it moves from the orbits 6,5,4 and 3 to orbit 2, energy will be released by the electron and different emission lines wll be produced.
