Answer Key — Fractional Precipitation Pogil

expressions to solve for the concentration of the added reagent ( Ag+Ag raised to the positive power ) required to initiate precipitation for each ion.

Using an answer key as a direct copy source bypasses the critical thinking required to pass chemistry exams. Instead, use your understanding of Kspcap K sub s p end-sub

For Ag2CrO4∶Ksp=[Ag+]2[CrO42−]⟹[Ag+]=Ksp[CrO42−]For cap A g sub 2 cap C r cap O sub 4 colon cap K sub s p end-sub equals open bracket cap A g raised to the positive power close bracket squared open bracket cap C r cap O sub 4 raised to the 2 minus power close bracket ⟹ open bracket cap A g raised to the positive power close bracket equals the square root of the fraction with numerator cap K sub s p end-sub and denominator open bracket cap C r cap O sub 4 raised to the 2 minus power close bracket end-fraction end-root The substance that requires the concentration of Ag+cap A g raised to the positive power to satisfy its Kspcap K sub s p end-sub expression will precipitate first. Step-by-Step POGIL Problem Walkthrough fractional precipitation pogil answer key

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When a precipitating reagent is added dropwise, the compound with the lower Kspcap K sub s p end-sub expressions to solve for the concentration of the

If you know the concentration of the ion already in the beaker, you solve for the concentration of the ion you are adding. Precipitation begins the moment the exceeds the Kspcap K sub s p end-sub . 3. Determining Which Ion Precipitates First A classic POGIL question might look like this: "A solution contains 0.10 M Cl−cap C l raised to the negative power and 0.10 M Br−cap B r raised to the negative power Ag+cap A g raised to the positive power is added, which silver salt forms first?" Step 1: Look up Kspcap K sub s p end-sub AgClcap A g cap C l AgBrcap A g cap B r Step 2: Calculate the needed to precipitate each. Answer: Since AgBrcap A g cap B r has a much lower Kspcap K sub s p end-sub

Therefore, AgI(s) will begin to precipitate when [Ag⁺] ≈ 8.5 × 10⁻¹⁶ M. Step-by-Step POGIL Problem Walkthrough user wants a long

The principles used in fractional precipitation are not just academic; they are the foundation of a surprising range of real-world technologies. Here are a few examples:

value: The compound is less soluble and precipitates easily. High Kspcap K sub s p end-sub