25.0 g of an impure sample containing cobalt was dissolved in acid and diluted to 1000.00 mL. 6.00 mL of this sample was removed, treated appropriately to give a colored solution, and then diluted to 250.00 mL. This final solution had an absorbance of 0.410. Calculate the percentage of cobalt (MW = 58.93 g/mol) in the original sample.

Q: In terms of the theory of color absorption, explain two ways that a solution can be blue.

A: Firstly understand the concept of complementary color theory, when a matter connects with white…

Q: What visibile reactions can be observed when you mixed bleach with NaI(aq)?

A: The given compounds are bleach and NaI. The name of bleach is sodium hypochloride( NaOCl).

Q: The following is the brief summary of how Aliquot 1 was prepared in Expt. 8: Step 1: The unknown…

A: Given data,Mass of steel sample=0.5079 gTotal volume of stock solution=200mL=0.200LVolume of stock…

Q: Write the balanced NET ionic equation for the reaction when CaBr₂ and Na₃PO₄ are mixed in aqueous…

A:

Q: 9. Explain the chemistry for the conversion of white phosphorous to red phosphorous

A: White phosphorus,red phosphorus and black phosphorus are three allotropic forms of phosphorus.These…

Q: An iron nail rusts when exposed to oxygen. For the following reaction, 4.91 grams of oxygen gas are…

A:

Q: Molybdenum has a BCC crystal structure, an atomic radius of 0.1363 nm, and an atomic  weight of…

A:

Q: A post transition metal in group 16   on the periodic table

A: The elements which are present to the right of a transition metal and to the left of the metalloids…

Q: Suppose 0.010 mol of each of the following compounds isdissolved (separately) in 1.0 L water: BaCl2,…

A: Elements are differentiated on the basis of their conductivity. Different compounds gave different…

Q: The concentration of Fe²+ in a sample is determined by measuring the absorbance of its complex with…

A: We would use formula of absorbance given as :  A = ECl  where, E is molar absorptivity which depends…

Q: To make this KNOWN solution, 0.1632 g was mixed with water (to the mark) in a 100.mL volumetric…

A:

Q: Predict which test tube (A, B, or C) will glow the longest. Briefly explain your reasoning.

A: Solutions- There are three test tubes A, B, and C.

Q: 1. Calculate the volume of 0.0200 M KMnO4 that would be required to complete 0.20 grams of…

A: Balanced equation for the reaction between KMnO4 and K3[Al(C2O4)3] 10K3[Al(C2O4)3].3H2O + 12KMnO4…

Q: Would you expect salts of the gold(I) ion, Au+, to be colored? Explain.

A: The presence of a partially filled d orbital is responsible for the coloration in ions because of…

Q: 1) List an oxidizing agent that will: a) oxidize Cu to Cu*2, without oxidizing Cu to Cu*1. b)…

A: Note: As per company policy we are supposed to attempt first three subparts only. Please repost…

Q: What is the role of heavy metals in environmental pollution and how can they be controlled?

A: Heavy metals are a group of elements that have a high atomic weight and density, and are toxic to…

Q: A 0.0515 g pure potassium dichromate was dissolved in water and a large excess of KI was added. The…

A: Given,  Mass of pure potassium dichromate = 0.0515g. Volume of thiosulfate required = 45.54 mL The…

Q: mcdT dq T AS = = mcln T/T

A: Entropy change is a definite quantity independent of the path followed for the change and depends…

Q: What species is responsible for the colour change when KSCN(aq)  and  Fe(NO₃)₃(aq) are mixed? Why is…

A: In the given question we have to write Reaction involved between KSCN(aq) and Fe(NO3)3(aq) and…

Q: Pb(NO3)2 + Ni(en)1(H20)4SO4 ------> Pb(SO4)(s) + 2NO31- + Ni2+ + 4H2O + 1 en b. How many grams of…

A: Number of atoms, ions and molecules present on a given amount can be determined by “Mole Concept”.…

Q: The transition metal complex ion [Ru(Bipy)3]*2 has a molar absorptivity of 1.35x10*ª M-1-cm-1 (at a…

A: According to Beer Lambert's Law, A=ε.C.l where A is the absorbance, ε is molar absorptivity, C is…

Q: 6. A mixture contains at least one of the ions in the silver group (Ag*, Hg²*, Pb²*). Read the…

A: The qualitative analysis of the metal ions involves the identification of metal ions that are…

Q: A sample of ore containing Technetium weighed (4.470x10^3) g. This sample was heated in a solution…

A: Given:Molar mass of Tc(No3)3=284.03 g/molMolar mass of Tc2S3=292.20g/molMolar mass of Tc= 98.00…

Q: 2 Ba2+ (aq) + Cr20,2 (aq) + H2O (1) =2 BaCrO4 (s) + 2 H* (aq) Dichromate forms orange aqueous…

A: The equilibrium reaction given is,

Q: What hazards are associated with lead metal? Decrease size of red blood cells. Decrease number of…

A: Lead, a versatile metal, has been utilized throughout history for various applications, ranging from…

Q: What is the absorbance of a theoretical compound in a 5.26 x 10-5 M solution, a path length of 1.5…

A: The relationship between the absorbance and concentration is given by  A = ECl where A = absorbance…

Q: molar concentration of

A:

Q: 3. For the substitution of [Mn(OH2)oJ** to form [MnX(OH2)s]*, what experiments could you design to…

A: PLease fine the answer given below:

Q: You met Mr. Yap, CEO of a Penang-based semiconductor producing company. Mr. Yap mentioned that they…

A: Given: CaO can be used as an alternative to react with HF instead of NaOH.

Q: (H₂O)]²+ (aq) +4 Cl(aq) = [CoCl₂(aq) + 6H₂ pink blue lan haland Indiasting that hoth [Colk…

A:

Q: Briefly explain how AAS can quantify the amount of lead in sample solution?

A: Atomic Absorption Spectrometry (AAS) is a technique for measuring quantities of chemical elements…

Q: b) It was determined that the coordination compound (from above) also contained ammonia, NH3. In…

A: Given, mass of coordination compound = 0.2307 g Volume of HCl solution = 25.00 mL Concentration of…

Q: Approximate percent potassium there should be in potassium tris(oxalato)aluminate(III).

A:

Q: Cr(NO3)3 C.

A: Given,  Cr(NO3)3

Q: A medical lab technician creates a standard solutions of percent hemoglobin in whole blood. The…

A: The standard curve created by the technician is the absorbance versus percent hemoglobin, hence…

Q: Although KOH, RÜOH, and CSOH have little association between metal and hydroxide in aqueous…

A: To calculate the fraction of lithium in the form LiOH(aq) at equilibrium in 1.00 F LiOH solution.

Q: 11. Write the completed and balanced equation in molecular form with the correct physical state of…

A: In balanced reaction, number of atoms in reactant equal to number of that atom in product. Mass and…

Q: Question 3 Estimate the atomic weight of an element (in g/mol) with a BCC structure, cell edge…

A: We know that : density, d = nM/(a^3*NA) or, M = (d*a^3*NA)/(n) ...(1) Where, n = no. of atoms…

Q: Describe the term Crystal Field?

A: Crytal field theory describes the change in crystal energy resulting from the orientatin of…

Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.