ࡱ> \_[y bjbj 4X{{$$D&%%%%%%%$(*Z%%%%%w# W%0$%&0D&$+[r+ W%W%+k%D%%D&+ :  PROBLEM SESSION 4-CHEM 120 If 25.00 mL of a 3.00 M solution of HCl is added to 50.0 g of Ba(HCO3)2, how many mL of dry carbon dioxide gas will be collected at 25.0oC and 745 torr pressure? How many grams of Na2SO4 are required to prepare 25.00 mL of 0.200 M Na2SO4 solution? How many mL of 0.150 M CaCl2 contain 6.00 g of CaCl2? In 33.00 mLof 0.22 M (NH4)3PO4, there are how many Moles of (NH4)3PO4? Grams of phosphorous? Moles of phosphate ions? NH4+ ions? A solution is prepared by dissolving 81.15 grams of Na3PO4(12H2O in enough water to prepare 500.0 mLof solution. The density of the solution is 1.077 g/mL. Calculate The % anhydrous salt The % hydrated salt The molarity of Na3PO4 If 15.00 g of a mixture of 25.00% CaCl2 and 75.00% inert material are dissolved in 1.00 liter of water, how many mL of 0.500 M silver nitrate solution would be required to precipitate all of the chloride according to the equation: 2 AgNO3(aq) + CaCl2(aq) ( Ca(NO3)2(aq) + 2 AgCl(s) A 1.00 gram sample of (NH4)2SO4 is added to 50.0 mL of 0.450 M (NH4)3PO4 solution. Assuming no volume change, what are the resultant molarities of all ions in solution? 2.500 g of K3PO4 are dissolved in 100.0 mL of deionized water. To this solution are added 75.00 mL of 0.300 M AgNO3 solution. How many grams of Ag3PO4 will precipitate? How many grams of which reactant remains unreacted? What is the final concentration of K+? When 35.00 mL of 0.100 M iron(III) chloride are added to 20.00 mL of 0.200 M potassium phosphate, a precipitate of iron(III) phosphate is observed to form. Inventory the concentrations of all ions in solution and calculate the mass of the precipitate. A 35.00 mL aliquot of 0.1861 M sulfuric acid is mixed with 20.00 mL of a 0.3016 M barium hydroxide solution. Write the balanced chemical equation for the reaction and determine [H3O+], [OH-], [Ba+2], [SO4-2], pH, and pOH. Find the mass of Barium sulfate that precipitates. Fill in the table below Conjugate acidConjugate baseHC2H3O2CN-1NH3H2OH2OCH3NH3+ Calculate the hydroxide ion concentration in a solution if 35.27 mL of it exactly neutralize 24.30 mL of a 0.07243 M solution of sulfuric acid. A solution is prepared by dissolving 0.1162 grams of KOH in 250.0 mL of solution. Calculate [H+] [OH-] pH pOH Fill in the table below [H3O+][OH-]pHpOH3.582 x 10-66.498 x 10-93.76829.4751 A primary standard is made by dissolving 3.7627 grams of oxalic acid dehydrate in enough water to make 500.0 mL of solution. A 25.00 mL aliquot of the oxalic acid solution requires 41.87 mL of potassium hydroxide solution to titrate it to a phenophalein end point. A 25.00 mL sample of vinegar is titrated with 15.97 mL of the sodium hydroxide solution. What is the concentration of acetic acid in the vinegar? Solution A is a solution of HNO3 with a pH of 2.80. Solution B is a solution of NaOH with a pH of 11.30. Calculate the pH of the following solutions: 10.00 mL of A and 5.00 mL of B 10.00 mL of B and 5.00 mL of A How many mL of A must be added to 25.00 mL of B to make a solution of pH = 7.00? For each of the following compounds, determine the main intermolecular force. You may find it useful to draw Lewis structures for some of these molecules: 1) nitrogen ________________________________ 2) carbon tetrachloride ________________________________ 3) H2S ________________________________ 4) sulfur monoxide ________________________________ 5) N2H2 ________________________________ 6) boron trihydride ________________________________ 7) CH4O ________________________________ 8) SiH2O ________________________________ Explain why ethyl alcohol (C2H5OH) has a higher boiling point (78.40 C) than methyl alcohol (CH3OH; 64.70 C). Rank the following by from lowest to highest anticipated boiling point: C2H4, CH4, Ne, H3COCH3. Motor oil largely consists of molecules that consist of long chains of carbon atoms with hydrogen atoms attached to them. Using your knowledge of intermolecular forces, why wouldnt it be better to use a compound like glycerol. The formula of glycerol is CHOH(CH2OH)2. 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