Q2. Which is the product of these numbers, to the appropriate number of significant digits? [2.5 Points] (2.8 X 7.436) 4

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Q2 Which Is The Product Of These Numbers To The Appropriate Number Of Significant Digits 2 5 Points 2 8 X 7 436 4 1 (40.25 KiB) Viewed 31 times

Q2. Which is the product of these numbers, to the appropriate number of significant digits? [2.5 Points] (2.8 X 7.436) 4.81 -2.376 + (312.69) Q3. A 5.0 g of limestone sample was dissolved in HCI , then all calcium content in the limestone ionized. After that, the solution is treated with saturated ammonium oxalate to precipitate all of calcium ion in the form of calcium oxalate (CaC2O41s)). The precipitate was filtered, dried and weighed to a constant mass of 2.43 g. Determine the percentage by mass of calcium in the limestone sample? (5 Points) [4.5 Points) Q4. Calculate the solubility at 25°C of CaF2 (Ksp=3.9x10-41) if add to: (a) Deionized water. (b) 0.3M calcium chloride. (c) 0.2M sodium fluoride.