2. Review relevant class materials and answer the following questions: You are given a solution that may be either NaCl(aq, or Na2CO3(aq). Present a scheme to find which substance was present in the solution. a. b. Complete and balance the following equations and explain your results. BaCl, (aq)+ H,SO4(aq)→ .., AgNO; (aq) + CI (aq) →.

b) Water "softeners" work via the principle of ion-exchange. The tank of a water softener is filled with a soluble salt such as sodium chloride. As "hard" water passes through the tank, the undesirable ions in hard water (e.g., calcium, magnesium, and iron III) are exchanged for the more desirable "soft" (meaning more soluble) ions like sodium. Explain how swapping the "soft"-water sodium ions for "hard"-water ions would influence the behavior (the cleaning effectiveness) of soaps and detergents.

Complete and balance the following precipitation reactions. Include physical states. a. Ba(NO3)2 (aq) + CuSO4 (aq) -> b. K3PO4 (aq) + MgCl₂ (aq) ->

Balance the following equations and then write the net ionic equations. (Use the lowest possible whole number coefficients. Include states-of-matter in your answers. Use H+ instead of H3O+ to balance equations. Write weak electrolytes in their undissociated form. Leave any extra answer blanks empty. Omit any coefficients of 1.) (a) (NH4)3PO4 (aq) + Bi(NO3)3(aq) → BiPO4(s) + NH4NO3(aq) balanced equation + net ionic equation (b) AgOH(s) + H₂SO4 (aq) → Ag₂SO4(s) + H₂O(1) balanced equation net ionic equation net ionic equation (c) HCN (aq) + Co(OH)3 (s) → Co(CN)3(aq) + H₂O(1) balanced equation + + + + + ↑ + + + +

17. Predict whether or not a precipitation reaction will occur if the pairs of solutions that are given below are mixed. If you think a reaction will occur, write a balanced equation for the precipitation reaction. Na,S0,(aq) + K2CO3(aq)→ К,со, (аq) + Са(NO;3)2(aq) > СаCl2(aq) + NaNO3(аq) — СаCl2(aq) + 2AgNO,(aq) —

Does a reaction occur when aqueous solutions of sodium carbonate and manganese(II) iodide are combined? O yes no If a reaction does occur, write the net ionic equation. (Use the solubility rules provided in the OWL Preparation Page to determine the solubility of compounds. Be sure to specify states such as (aq) or (s). If a box is not needed leave it blank.) + →

Consider the neutralization reaction 2 HNO3(aq) + Ba(OH)2(aq). 2 H2O(l) + Ba(NO3)2(aq) A 0.105 L sample of an unknown HNO3 solution required 42.5 mL of 0.250 M Ba(OH)2 for complete neutralization. Wha the concentration of the HNO3 solution? concentration: .098

Complete and balance each of the following molecular equations (in aqueous solution). (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank. Use H* for hydronium ion.) write the molecular equation for Cu(OH)2 (s) + HC1(ag) +

Oo.125. Subject:- Chemistry

List the ions and molecules that may have precipitated as part of your final salt product. Step 1. Dissolve the Aluminum metal : (adding solid Al to a Kott Solution) Peaction between Al metal and kot. AICOH and H₂ gas.. Net ionic equation: Solution produces Tetrahydroko aluminate ion 2 A1 (s) + 20H (aq) + 6 +₂0 (1) → 2 Al (OH) - (aq) + 3H2(g) K+(aq) OH(aq) equation that describes the reaction of Sulfuric acid in water: OR H₂SO4 (aq) + H₂0 (1) H₂O+ (aq) + Hs 04" (aq) 2- HSO4 (aq) + H₂O (1) H₂0+ (aq) + 504³ (aq) Step 3: Neutralize base with acid OH reacts with acid: H₂Ocaq) + OH(aq) → 2+1₂0 (1) • Al(OH), reacts with small amount of acid; Alcot)" (q) + Hy" O cag) Al(only (n+ H₂OCD Al(OH) reacts with large amount of acid (with heat): Al (DH), (s) + 3H₂ 0 (aq) → A1 " (aq) + 6 H₂0 (1)