Potassium cyanide is a toxic substance, and the median lethal dose depends on th

Question

Potassium cyanide is a toxic substance, and the median lethal dose depends on the mass of the person or that ingests if. The median does of KCN for a person 185 Ib (93.9 kg) is 8.50 times 10^-3 mol What volume of M KCN solution contains 8.50 times 10^-3 mol of KCN? Express the volume of three significant figures and include the appropriable units. Gastric acid pH can/from 1 to 4 and most of the acid is HCI For a sample of stomach acid that is 2.85 times 10^-2 M in HCI how many of HCI are in 17.5 mL of the acid? Express the amount to three significant figures and include the appropriate units.

Explanation / Answer

Part A

We know that Molarity , M = Number of moles / volume of the solutionj in L

So Volume of the KCN solution , V = number of moles / molarity of the KCN solution

                                                  = 8.50x10-3 mol / 0.0320 M

                                                  = 0.266 L

                                                  = 266 mL sonce 1 L = 1000 mL

Part B

Number of moles , n = Molarity of HCl x volume in L

                              = 2.65x10-2 M x 17.5 mL x10-3 L/mL

                              = 46.37x10-5 mol

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