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2. How are the Group I cations first precipitated from solution? 3. Write the net-ionic equation...
Pre-Lab for Qualitative Analysis of Silver Group I Cations Lab 1. What are the ions that are considered Group I cations? 2. Based on the Activities Series of Elements, explain why Group I ions would form precipitates when a strong, concentrated acid (such as HCI) is added to them. 3. Pby, and K Cro, will react with each other to form a precipitate if the concentrations are high enough. Write the complete, balanced equation for the reaction of Pbs and...
Another form of this equation (called the complete ionic equation) indicates the species that are actually present in solution. 2Na+ + CO32-+2hr + 2 cr . 4 co2 +H2O + 2 Na. + 2 cr Since balanced chemical equations indicate only substances that change, this equation simplifies to This simplified equation is called a net ionic equation. The evolution of CO2 gas is visible as tiny bubbles. Sulfate, so2 Sulfate, So,, is found in compounds such as NaSO4. If a...
Group I Cations A INTRODUCTION Most metal halides are soluble in water and dilute hydrochloric acid. The exceptions are silver ion, Ag mercurous ion, Hg,: and lead(II) ion, Pb. Consequently, the addition of HCI to a solution of metal cations leads to the selective precipitation of these three ions. While the theory behind the separation and identification of these ions has been outlined in the general discus- sion of the qualitative analysis scheme, some aspects of this chemistry need to...
3. A solution that may contain any of the group III cations. Treatment of the solution with CIO in alkaline medium yields a yellow solution and a colored precipitate. The acidified solution is unaffected by treatment with NH,OH. The colored precipitate dissolves in nitric acid; addition of excess NH,OH to this acidic solution produces only a blue solution. Which group III ions are present? Which are absent? Which are in doubt? How would you remove all doubt? 3. A solution...
EXPERIMENTAL PROCEDURE: GROUP I CATIONS Test a known solution that contains all 3 cations simultancously with your unknown. Follow the same procedure (separately) for both the unknown and known solutions. Wear gloves during all procedures. STEP 1: Precipitation of Group I. To 10 drops (only!) of the solution to be analyzed, add 2 drops 6 M HCl. Stir well. Centrifuge and decant the solution (S1) from the ppt (P1). Treat the ppt Pl according to Step 2. (There is no...
The pH is adjusted to 0.5 and thioacetamide is added to an unknown containing Group 2 cations. A black precipitate is formed, insoluble in NaOH but completely soluble in HNO3. When NH3 is added a white precipitate is forms and the solution turns deep blue. 1. What ion(s) are clearly absent? 2. What ion(s) are clearly present? 3. Write the net ionic equations for all observations
(1) Write the step-wise net ionic equations for all the cations that show amphoteric behavior in excess NaOH solution. (include Al^3+ ion) (2) Write the balanced net ionic equations for all the cations which exhibit complex formation with ammonia. (include Ni^2+ and Co^3+)
Qualitative Analysis of Group I Cations: Precipitation and Separation of Group I lons Nam Partner's Name of any) Lab Section MWITH THE Advance Study Assignment 1. The reagent (chemical substance used) to precipitate the all the cations of Group _(symbol and molarity 2. Why do we add an additional drop of the precipitating to the Group I precipitate formed? 3. When we centrifuge why must we use a blank test tube (containing an equal volume of water) on the opposite...
- You have a clear colorless unknown solution with a group 1 cation. After adding some hydrochloric acid solution you obtain a white precipitate. Addition of ammonia causes the white precipitate to dissolve. Acidifying with nitric acid makes the precipitate reappear. Which cation do you suggest was in the unknown sample? Write the net ionic equation of any reaction that may occur (4P). 3. When testing for the presence of sulfate, what reagent is added to the solution? What final...
Sect. Date Name Prelaboratory Assignment: Qualitative Analysis Group III Cations 1. Prepare a complete flow chart for the procedure and put it on your data sheet. 2. Write balanced net ionic equations describing each of the following reactions: Dissolution of Ni(OH), in nitric acid. Oxidation of Cr'to Cr by CIO in alkaline solution (CIO is converted to CI') The confirming test for Fe 3. A solution that may contain any of the group II cations. Treatment of the solution with...