Apes biodiversity unit
Answer Key Precipitation Lab Purpose: 1. Identify the ions present in various aqueous solutions. 2. Combine solutions and identify the reactions that form precipitates. 3. Write balanced molecular...
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Mar 09, 2018 · CaCl2(aq)+ N a2CO3(aq) → 2N aCl(aq) +CaCO3(s) ⏐↓. This produces a precipitate of calcium carbonate, and can be collected by filtrating the mixture afterwards. Note that this is a precipitation reaction, where two aqueous solutions are mixed together and form an insoluble precipitate, which can be then filtered out to be collected. Answer link.
There is no answer key for Writing Parts 2 and 3 of the Reading and Writing paper, but there are sample answers and examiner comments in the relevant pages of the B1 Preliminary for Schools...
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Check your answers. a) BaSO4(s) and KCl (aq) b) PbCrO4(s) and NaNO3(aq) 2. Determine the products and calculate the mass of the precipitate that is formed after 177.2 mL of a 1.25 M Na 2 CrO 4 ( aq) solution is mixed with 250 mL of a 1.25 M AgNO 3 ( aq) solution. AgNO 3 ( aq) + Na 2 CrO 4 ( aq) →. Check your answers.
Precipitation separates DNA from this cellular debris. First, Na+ ions (sodium) neutralize the negative charges on the DNA molecules, which makes them more stable and less water soluble. Next, alcohol (such as ethanol or isopropanol) is added and causes the DNA to precipitate out of the aqueous solution because it is not soluble in alcohol.