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ACT Question for May 22nd

When water droplets containing dissolved ions freeze, opposite charges may develop between the newly formed ice crystals and the still unfrozen droplets. As the ice crystals and droplets separate in a cloud, charged regions form.

Solutions of four sodium (Na) salts, containing fluoride (F-), chloride (Cl-), bromide (Br-), and iodide (I-) ions, were each made at six different concentrations, in moles per liter (moles/L). The solutions were slowly cooled until freezing began. The electrical potential (whether the droplets had a positive or negative charge with respect to the ice crystals) was measured in volts. The results are shown in the Figure.

A scientist could best determine which ion (F-, Cl-, Br-, or I-) produced the greatest electrical potential in the Experiment by comparing the electrical potential that develops between ice and:

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