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Tests for negative ions

The tests for negative ions, carbonate, chloride, bromide, iodide and sulfate, as one reference table with the reagent and the positive result for each. One click in the science table builder puts it on the board.

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MBMrs Bennet
Science Table Builder
Tests for negative ions
The reagent and positive result for the halides, sulfates and carbonates.
IonTestPositive result
CarbonateAdd dilute acidFizzing, limewater turns milky
ChlorideSilver nitrate and nitric acidWhite precipitate
BromideSilver nitrate and nitric acidCream precipitate
IodideSilver nitrate and nitric acidYellow precipitate
SulfateBarium chloride and hydrochloric acidWhite precipitate

A hand-built replica of the real builder page, not a screenshot. Every control shown exists in the product.

Part of the Science table, Bond energies table, Flame test colours and Tests for gases pages.

Why this works in Chemistry

The halide rows are the ones to teach from the table. Chloride, bromide and iodide all use silver nitrate with nitric acid, and the answer is a colour on a gradient, white, cream, yellow, which pupils muddle unless they see the three together. The acid is there for a reason worth saying out loud, it removes carbonate ions that would otherwise give a white precipitate of their own.

Sulfate follows the same pattern with barium chloride and hydrochloric acid, and carbonate is the odd one out, a fizz you pass through limewater. Laid out as five rows the logic is visible, acid first to clear the carbonate, then the reagent that names the ion, and a class that has read it that way can reproduce it in the required practical rather than recite it.

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