Baking soda mix with vinegar and lemon juice will cause the balloon to expand more.
The step-by step the researcher needs are first you got to use [4] 10oz plastic water bottle, [4] balloons 1/2 cup of oil, 1/2 cup of lemon juice, 1/2 cup of baking soda, 1/2 cup of vinegar .with oil the baking soda sat at the bottom foam up a little,I use ½ cup of baking soda 1/2 cup of omega oil . And with the lemon juice it sat the bottom and foam up then it expand. with the vinegar I use ½ tsp of baking soda And vinegar expand the balloon .the second time I tried it I had to add a