A shortcut to using a hand mixer is to stir your wet ingredients by hand then add the baking soda to the mix. (ambitiouskitchen.com)
I used your ingredients and it was very dense, will try adding the baking soda next time. (bakeorbreak.com)
By adding the baking soda and vinegar to this experiment, the lava lamp effect worked without us having to move the bottle at all. (viewsfromastepstool.com)