Worksheet 6 Displacement Reactions and Acid/Base reactions
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1 Worksheet 6 Displacement Reactions and Acid/Base reactions Displacement reactions are those in which ions recombine in solution. If the products of this recombination are insoluble in water, a solid precipitate will form. The solubility rules for common salts are summarized below: 1. Most nitrate salts are soluble. 2. Most salts of sodium, potassium and ammonium cations are soluble. 3. Most chloride salts are soluble. Exceptions: silver, lead (II), and mercury (I) chloride (Hg 2 Cl 2 ) 4. Most sulfate salts are soluble. Exceptions: calcium, barium and lead (II) sulfate 5. Most hydroxides are only slightly soluble Exceptions: sodium, potassium, calcium and barium hydroxides 6. Most sulfide, carbonate and phosphate salts are only slightly soluble. Based on these rules, decide if each of the following compounds is soluble (s), or insoluble (i),and which rule this is based on: compound solubility rule silver chloride i 3 manganese (II) hydroxide i 5 calcium nitrate s 1 sodium carbonate s 2 nickel (II) sulfate s 4 magnesium sulfide i 6 calcium carbonate i 6 potassium hydroxide s 2 ammonium nitrate s 1 potassium chloride s 2 aluminum hydroxide i 5
2 Each of the compounds in the grid below is water soluble. However, when they are mixed, insoluble compounds may be formed. First, write out the ions that form when the compounds dissolve in water. Then, in each cell of the grid, decide whether or not an insoluble precipitate will form. If a precipitate will form, write out its formula. K 3 PO 4 (NH 4 ) 2 S AgNO 3 CaCl Ag 3 PO 4 Ag 2 S no ppt AgCl, CaSO 4 Pb(NO 3 ) 2 Pb 3 (PO 4 ) 2 PbS no ppt PbCl 2 KOH no ppt no ppt AgOH no ppt MgCl 2 Mg 3 (PO 4 ) 2 MgS AgCl no ppt ml of 1.0 M iron (III) nitrate is mixed with ml of 1.0 M sodium hydroxide. A precipitate forms. Write the molecular equation, ionic equation and net ionic equation for this reaction. a. Balanced molecular equation (leave ionic species as molecules) Fe(NO 3 ) 3 (aq) 3NaOH(aq) Fe(OH) 3 (s) 3NaNO 3 (aq) b. Ionic equation (allow soluble species to appear as ions) Fe 3 (aq) 3NO 3 - (aq) 3Na (aq) 3OH - (aq) Fe(OH) 3 (s) 3Na (aq) 3NO 3 - (aq) c. Net ionic equation (eliminate "spectator" ions) Fe 3 (aq) 3OH - (aq) Fe(OH) 3 (s)
3 d. Determine the mass of the precipitate. Use the net ionic equation to make these calculations. i. How many moles of the cation are present? Femol0.10NOFemol1Femol1solnL1NOFemol mL1LsolnNOFemL100.0ii. How many moles of the anion are present? OHmol0.10NaOHmol1OHmol1solnL1NaOHmol mL1LsolnNaOHmL100.0iii. Based on stoichiometry, is there a limiting reagent? Yes we need 3 moles of OH - for every 1 mole of Fe 3, so the anion is limiting iv. How many moles of precipitate will form? 33Fe(OH)mol0.033OHmol3Fe(OH)mol1OHmol0.10 v. How many grams of precipitate is this? 3333Fe(OH)g3.5Fe(OH)molFe(OH)106.9Fe(OH)mol0.033 vi. What is the concentration of the excess ion? usedfemol0.033ohmol3femol1ohmol mol Fe mol Fe mol Fe 3 remaining M0.33solnL0.200Femol0.067][Fe33
4 Acid/Base reactions Strong acids (HA) dissociate completely in water to produce H and A -. They are called "proton donors" since they give off a proton, H. Strong bases (BOH) dissociate completely in water to form B and OH -. They are called "proton acceptors" since the OH - will react with H. In a neutralization reaction, the H and OH - combine to form water (H 2 O), leaving the components of salt, A - and B in solution. 1. What volume of M HCl is needed to neutralize 20.0 ml of M NaOH? HCl is a strong acid and NaOH is a strong base. a. How many moles of OH - are present? OHmol NaOHmol1OHmol1solnL1NaOHmol0.350solnNaOHL0.020b. How many moles of H are needed to neutralize the OH -? mol H mol OH - in a neutralization reaction mol H c. What volume of M HCl is needed? HClmL35.0solnL0.0350HClmol0.200solnL1Hmol1HClmol1Hmol When titrating M HCl with a calcium hydroxide solution of unknown concentration, 35.0 ml of acid are required to neutralize 25.0 ml of the base. Calculate the molarity of the base. a. Write the balanced molecular equation. 2HCl(aq) Ca(OH) 2 (aq) 2H 2 O(l) CaCl 2 (aq) b. Write the balanced net ionic equation. H (aq) OH - (aq) H 2 O(l) c. How many moles of H are present? Hmol HClmol1Hmol1solnL1HClmol0.150solnHClL0.035d. How many moles of OH - are required to neutralize the acid? mol OH - mol H in a neutralization reaction mol OH - e. What is the molarity of the base? 2-2-Ca(OH)mol OHmol2Ca(OH)mol1OHmol MsolnL0.025OHmol ]OH[Ca-2
5 3. A chemist dissolves g of an unknown monoprotic (one acidic H) acid in water. She finds that ml of M NaOH are required to neutralize the acid. What is the molar mass of the acid? a. Units of molar mass are g/mol. How many grams of acid are present? g acid b. How many moles of base are required to reach the equivalence point? OHmol NaOHmol1OHmol1solnL1NaOHmol0.426solnNaOHL c. How many moles of acid are present? Monoprotic acid means mol acid mol H mol OH mol OH mol H mol HA d. What is the molar mass of the acid? g/mol48.2hamol hag0.300
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