Question

can someone help me to answer questions # 2 and 3 ? thanks

Fall 2019-Spring 2020 CHE 221/222 Laboratory Pre-Lab Reading 1. Use a solubility table and periodic table to complete the following table: Molar Mass (g/mol) 59.44 469.97 84.9947 143. 32 22.4898 107-868 Substance Is it Soluble in Water? yes YeS Yes NO Chemical Formula Nacl Aq No3 Na. NOs A4CI Nat Agt Cl- NO3- Sodium chloride Silver nitrate Sodium nitrate Silver chloride Sodium cation LS NO Yes yes Silver cation Chlorine anion 35.Y53 Nitrate anion 62.0049 2. Using the information in the introduction and from your course textbook, propose a molecular equation, ionic equation, and net ionic equation for the precipitation of silver chloride from sodium chloride and silver nitrate. 3. You add enough 0.05 M Ca(OH)2 (lime) to fully precipitate all the magnesium ions from a 100 mL sample of hard water. The balanced net ionic precipitation reaction is shown below. After filtering and drying the resulting precipitate, you find that you precipitated 0.043 g of magnesium hydroxide. What was the concentration of magnesium in the hard water? Ca(OH)2 (aq) + Mg (aq) Mg(OH)2 (s) + Ca2 (aq)

Answer 1

9) Molecular Euation Agciis) t NaNO, (na) AgNo, a) + Nacl pa) Tonic Equations + Na' ea) tNo 4 Ag aa) + No aa) + Na (ag) Craa) Agc16) Net ionic cauation: Ag'aa) Ag Cl(s) + CIraa) (3) Me (oH) )Caoa) O043 9 Molecular cweight of Mgo258 -319+ gimel Wleight of Ma in1mole of MgoH)24 30s That is 58 319 a of MaoH emtains 24 305 a sf Mg 24 30 5 58 319 ot Ma O043 of MaoH Cantains 24.305 58.3197 of Mg2 0.037 Concentation of Ma -0.037 x 10-00 MWX Vol in m 24 305 I00 =O.015 M