Methanol (CH3OH) does not change its color to yellow upon the addition of sodium metal. This is because the reaction between sodium metal and methanol is a vigorous reaction that produces hydrogen gas and sodium methoxide.

Here's what happens:

1. Reaction: Sodium metal reacts with methanol to form sodium methoxide (CH3ONa) and hydrogen gas (H2).

2. Equation: 2Na + 2CH3OH → 2CH3ONa + H2

3. Observations:

* Vigorous reaction: The reaction is exothermic, meaning it releases heat, and often leads to bubbling and fizzing.

* Colorless solution: The resulting solution of sodium methoxide in methanol is colorless.

Therefore, the yellow color you are referring to is likely not due to a reaction with methanol. It's important to note that sodium metal is highly reactive and should only be handled with proper safety precautions.