The result will usually be that the vinegar cleans the pennies better, demonstrating that a lower-pH solution is better at cleaning discoloration due to oxidation. The volume of liquid and the material of the penny are both controlled variables in this experiment. This experiment is especially good for teaching the concept of a controlled variable if you include a third variable -- how dirty the pennies are.
1 doctor agreed: Yes: Pinworm symptoms can include gastrointestinal upset, anal or vaginal itchiness, loss of appetite, difficulty sleeping, irritability, restlessness. Untreated pinworm infection can lead to weight loss, diarrhea, genital rash, urinary incontinence and vaginal discharge.
Numerous bacteria, viruses, and parasites cause diseases in the intestines that result in diarrhea, dysentery, constipation or perianal irritation. They may also cause nausea, vomiting, and abdominal cramping. If the infection is in the small intestine, symptoms include watery diarrhea and vomiting. Infections in the large intestine can cause diarrhea and can result in an invasive and inflammatory disease called dysentery (small fecal volume with mucus and blood) (Table SI-1). Table SI-1.