General Chemistry Answers

A 15.00 g sample containing mixed alkali and other inert components was dissolved and diluted to 300 mL with water. A 20 mL aliquot was titrated with 5.02 mL of 0.5352 M HCl to reach PHP endpoint. Another 20 mL aliquot was titrated to the BCG endpoint, using up 18.87 mL of titrant in the process. 

How did Australia’s first peoples (aboriginals) remove toxins from foods other than cycads using solubility equilibrium?

arrange the compounds in increasing in terms of surface tension and vapor pressure

H2O, H2S, Br2, NaCl

5.21 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate ∆H, in kJ/mol, for the dissolution of MgSO₄. (The specific heat of water is 4.184 J/g･°C and the density of the water is 1.00 g/mL). You can assume that the specific heat of the solution is the same as that of water.

Using the three-point test, how can I calculate the length in a flexural strength, when the flexural strength, W, and load is already given

1. Calculate the amount of calcium carbonate that would remain unreacted if 15.0g of calcium carbonate were reacted with 0.2moles of dilute hcl

2.18cm of 0.125M potassium hydroxide solution required 32.cm2 of dilute sulphuric acid for complete neutralisation.calculate concentration of sulphur acid in grams

 In a coffee-cup calorimeter, 100.0 g of H2O and 100.0 mL of HCl are mixed. The HCl had an initial temperature of 44.6 ℃ and the water was originally at 24.6 ℃. After the reaction, the temperature of both substances is 31.3℃.  Was the reaction exothermic or endothermic?

A compound used in cancer treatment [Pt(NH3)2Cl2], is prepared by reaction of ammonia with potassium tetrachloroplatinate: K2PtCl4 + 2 NH3 → 2 KCl + Pt(NH3)2Cl2 If 3.42 g of K2PtCl4 and 1.61 g of NH3 give 2.08 g of cisplatin, what is the percent yield of the reaction?

The two tanks to the right are labeled with the boiling point of the gases contained in that tank. One of the tanks contains pure fluorine, F2, and the other contains hydrogen fluoride, HF. Your problem to solve is to determine which tank contains HF and which tank contains F2. You must support your answer with evidence

Seawater contains dissolved salts at a total ionic concentration of about 1.13 mol/L. Determine the pressure, in atm, needed to prevent the osmotic flow of pure water into seawater through a membrane permeable only to water molecules. Round your answer to three (3) significant figures. Omit the unit in your final answer.