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When loaded from the model kit, the calculator loads with the model formula. Enter calculations in standard chemical formula notion and click Calculate. Entry parentheses are used in chemical context only. Use square brackets for forcing arithmetic operator precedence. Operator precedence is standard left to right multipy/divide then add/subtract. Calculations are saved in calculator memory for convenient reloading of calculations. Sample Calculation: Al2/Al2(SO4)3*100
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