Question: Lanthanum metal forms cations with a charge of 3+. Consider the following observations about the chemistry of lanthanum: When lanthanum metal is exposed to air,

Lanthanum metal forms cations with a charge of 3+. Consider the following observations about the chemistry of lanthanum: When lanthanum metal is exposed to air, a white solid (compound A) is formed that contains lanthanum and one other element. When lanthanum metal is added to water, gas bubbles are observed and a different white solid (compound B) is formed. Both A and B dissolve in hydrochloric acid to give a clear solution. When either of these solutions is evaporated, a soluble white solid (compound C) remains. If compound C is dissolved in water and sulfuric acid is added, a white precipitate (compound D) forms.
(a) Propose identities for the substances A, B, C, and D.
(b) Write net ionic equations for all the reactions described.
(c) Based on the preceding observations, what can be said about the position of lanthanum in the activity series (Table 4.5)?

Step by Step Solution

★★★★★

3.55 Rating (166 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a A La2O 3 Metals often react with the oxygen in air to produce metal oxides B LaOH 3 W... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

876-E-C-E-E-C (364).docx

120 KBs Word File

Students Have Also Explored These Related Chemical Engineering Questions!

The equilibrium constant for the reaction of NH3 (aq) + H2O NH+4 + OH- is Kb = 1.479 10-5 at 5C 1.570 10 -5 at 10oC (a) Assuming H and S are constant in the interval 5 - 10C (probably a good...

A small metal ball with a charge of 0.05 C and a mass of 25 g (0.025 kg) enters a region where there is a magnetic field of 0.5 T. The ball is traveling with a velocity of 200 m/s in a direction...

Lanthanum was reacted with hydrogen in a given experiment to produce the nonstoichiometric compound LaH2.90. Assuming that the compound contains H 2 , La 2+ , and La 3+ , calculate the fraction of La...

The benzene ring alters the reactivity of a neighboring group in the benzylic position much like a double bond alters the reactivity of groups in the allylic position. Benzylic cations, anions, and...

Model 1: Ionic Charges for Selected Elements Metals form cations (positive ions); Nonmetals form anions (Hydrogen can form both) H* Lit Na* K+ Mg+ Ca+ Cr+ Mn+ Fe+ Co+ Cu* Zn+ Cr+ Mn Fe+ Co+ Cu+ Sp+...

Table 1. Reactions of Copper. Reactants, reagents, products, and observations. Reactions of Copper In this experiment, some of the reactions of copper and its compounds will be studied. Many of these...

Refer to the nomenclature flowchart (Figure 3.11) to name each compound. a. XeO 3 b. KClO c. CoSO 4 Inorganic Nomenclature Flowchart IONIC Metal and nonmetal Metal forms one type of ion only. name...

Refer to the nomenclature flowchart (Figure 3.11) to name each compound. a. HNO 2 (aq) b. B 2 Cl 2 c. BaCl 2 d. CrCl 3 Inorganic Nomenclature Flowchart IONIC Metal and nonmetal Metal forms one type...

Use the flowchart in Figure 3.11 to name each compound. (a) SO 2 (b) HClO 4 (aq) (c) CoF 2 Inorganic Nomenclature Flowchart Metal forms one type of ion only. name of cation (metal) IONIC Metal and...

Metal forms one type of ion only. name of cation (metal) IONIC Metal and nonmetal name of cation (metal) Example: Cal calcium iodide Metal forms more than one type of lon base name of anion...

Refer to the nomenclature flowchart (Figure 3.11) to name each compound. a. KClO 3 b. I 2 O 5 c. PbSO 4 Inorganic Nomenclature Flowchart IONIC Metal and nonmetal Metal forms one type of ion only....

The town of Newport obtained a corporate MasterCard that was given to the town clerk for purchasing fuel for the town hall. The town clerk used the card for personal restaurant, hotel, and gift shop...

The accounts in the ledger of Dependable Delivery Service contain the following balances on July 31, 2014. Accounts Receivable $11,400 Prepaid Insurance $ 1,800 Accounts Payable 7,400 Maintenance and...

discuss how Paul Polman used adaptive leadership principles to lead Unilever through global challenges related to culture, sustainability, and corporate responsibility

8. Use the Divergence Theorem to evaluate x dy dz + xy dz dx + xz dx dy, where S is the surface of the region bounded by the closed cylinder x2 + y? = a, (0

2. Evaluate . (V x F). ds, where S is the surface of the paraboloid x2 + y2 + z = 4 above the xy-plane and F = (x + y 4) i + 3 xy + (2 xz + z) k. Ans. - 4 n

Apply Divergence Theorem to evaluate (f(1x? + my? +nz?)ds 11. taken over the sphere (x a)? + (y b)? + (z c)? = r2, 1, m, n being the direction cosines of the external normal to the sphere. (I June...

Fill-in the blank. Using algebraic substitution, the f x?Vx + 3dx equals 2/(x + 3)3 +3) _ 6(x+3) |+c. +. 7 3 . x+3 . . 3 D. 3(x + 3)2

Explain each point in details Types of automation Fixed Automation: High investment, high production volume, Inflexible system 1. 2. Programmable automation: High investment in general purpose...

Problem 5.12 Non-transitive dice: Consider 3 six-sided dice whose faces are labeled as follows: Die 1 = {5, 7, 8, 9, 10, 18}; Die 2 = {2, 3, 4, 15, 16, 17}; Die 3 = {1, 6, 11, 12, 13, 14}. Let Yi...

The figure shows a finger exerciser used by law-enforcement officers and athletes to strengthen their grip. It is formed by winding A227 hard-drawn steel wire around a mandrel to obtain 2 turns when...

The rat trap shown in the figure uses two opposite-image torsion springs. The wire has a diameter of 0.081 in, and the outside diameter of the spring in the position shown is in. Each spring has 11...

Wire form springs can be made in a variety of shapes. The clip shown operates by applying a force F. The wire diameter is d, the length of the straight section is l, and Youngs modulus is E. Consider...

You own a portfolio equally invested in a risk-free asset and two stocks. If one of the stocks has a beta of 1.32 and the total portfolio is equally as risky as the market, what must the beta be for...

Show by resolution that B follows from S where S = {A & B, C}

PERSONAL FINANCE PROJECT Answer the following questions. Critically think through your answers with the knowledge that you have learned in this class. You can refer back to the textbook. Keep in mind...