QUESTION 5
The blocks turned yellow after placing them into the acetic acid solution because:
The acetic acid diffused into them, lowering the pH, which turned the bromothymol blue yellow.
The acetic acid diffused into them, raising the pH, which turned the bromothymol blue yellow.
The sodium bicarbonate diffused into them, lowering the pH, which turned the bromothymol blue yellow.
The sodium bicarbonate diffused into them, raising the pH, which turned the bromothymol blue yellow.