(b) A student knew that calciun hydroxide could be made by adding calcium to water. The student added 0.00131 mol of calcium to a beaker containing about 100 cm of water. A reaction took place as shown by the equation below. All the calcium hydroxide formed was soluble. Ca(s) + 2H,0(1) → Ca(OH),(aq) + H2(g) (1) Calculate the mass of calcium that the student added. mass of calcium %3D (ii) Calculate the volume of hydrogen gas. in dm?, produced in this reaction at room temperature and pressure, RTP. volume of hydrogen gas = dm3 ii) The student transferred the contents of the beaker to a 250 cm3 volumetric flask and water was added to make the solution up to 250 cm. Calculate the concentration, in mol dm3, of hydroxide ions in the 250 cm solution.

Q: Many metal ions are precipitated from a solution by the sulfide ion. As an example, consider…

A:

Q: Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric…

A:

Q: One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is…

A: Step 1:The balanced equation for this reaction is: CdCl2(aq) + 2AgNO3(aq) → 2AgCl(s) + Cd(NO3) From…

Q: A 23.5 g sample of NaCl was placed in a 500.0 mL volumetric flask, which was filled to the mark with…

A:

Q: Copper (II) chloride, CuCl2(aq) solution is reacted with aluminum hydroxide, Al(OH)3(aq) solution.…

A: From balanced ionic reaction we can determine net ionic reaction.

Q: If 60.13g of Nb(s) are added to 125.0ml of a 5.96mL of a 5.96 M solution of HClO4(aq), what is the…

A: Given that -  Mass of Nb(s) = 60.13 g  Volume of HClO4 Solution = 125.0 mL  Molarity of HClO4…

Q: Aqueous solutions of barium chloride (BaCl 2 ) and silver nitrate (AgNO 3 ) are mixed to form solid…

A: Ionic equation is an equation in which ions are explicitly shown. Net ionic equation is the chemical…

Q: A 30.0 mL sample of an unknown HClO4 solution requires 40.3 mL of 0.108 M NaOH for complete…

A:

Q: The Burke Museum at the UW is analyzing a dinosaur bone sample for the amount of calcium it…

A: The solid

Q: 250.0 mg of copper(II) sulfate pentahydrate (CuSO4•5H2O, 249.69 g/mol) was dissolved in water to…

A: Since mass of CuSO4•5H2O used = 250 mg = 0.25 g              (since 1 g = 1000 mg) Hence moles of…

Q: To measure the amount of chlorine in a well-boring fluid, an analytical chemist adds 0.260M silver…

A: Given,  Concentration of silver nitrate is = 0.260 M. Mass of fluid is = 21 g  Final mass of product…

Q: A chemist prepares a solution of iron III bromide FeBr3 by measuring out 3.00g of FeBr3…

A: Answer : mole  = mass / molecular weight molarity  = mole * 1000/ volume  (ml) molecular weight of…

Q: One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is…

A:

Q: 100.0 mL of an aqueous solution containing 0.250 M KOH(aq) is mixed with 100.0 mL of an aqueous…

A: First of all, we need to write down the balanced chemical.  The molar mass of Fe(OH)3 = 106.87g/mol

Q: Suppose that 40.0 mL of 0.100 M NaOH(aq) is added to 10.0 mL of 0.200 M Cu(NO3)2(aq). (a) Write the…

A: (a) The chemical equation for the precipitation reaction is:   Cu(NO3)2(aq) + 2NaOH(aq) ->…

Q: Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride:…

A:

Q: 170.00 mL of 0.500 M BaCl2(aq) is mixed with 60.000 mL of 0.500 M Li3PO4(aq). Assuming 100% yield,…

A: The overall reaction will be :   3 BaCl2(aq) + 2 Li3PO4(aq) = Ba3(PO4)2(s) + 6 LiCl(aq)…

Q: How many grams of NiSO4⋅7H2O would be required to prepare 5.00×102 mL of a solution that is 0.300 M…

A: The molarity of a solution is defined as the ratio of moles of solute and the volume of solution in…

Q: A solution of NaCl(aq) is added slowly to a solution of lead nitrate, Pb(NO3)2(aq), until no further…

A:

Q: A 2.88 g sample of iron ore is transformed to a solution of iron(II) sulfate, FeSO4. This solution…

A:

Q: Boric acid, H3BO3, is commonly used in eyewash solutions in chemistry laboratories to neutralize…

A: To calculate the number of moles of NaOH used in the reaction, we can use the given concentration…

Q: What mass of Ca(OH)2 is required to react completely with a 25.00 mL sample of  0.1234 M HCl(aq)?

A:

Q: What volume of a 0.250 M AgNO3 (aq) solution Contains 2.34g of silver nitrate?

A:

Q: A solution is prepared by dissolving 45.6 g of Mg(NO3)2 in 515 g of water. The density of the…

A: Definition: Molarity is a concentration term for a solution. The molarity of a given solution is…

Q: Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric…

A: The balanced equation of the reaction is-

Q: 2 Al(s) +3 CuCl2(aq) → 3 Cu (s) + 2 AlCls (aq) A piece of aluminum metal is placed in an aqueous…

A: Introduction :  We have to tell remaining two ions which are formed in this reaction .

Q: A chemist prepares a solution of iron III  bromide    FeBr3    by measuring out  0.22g  of…

A: To solve this problem we have to calculate the Molarity of the given solution .Since we know that…

Q: A student finds that it takes 46.16 mL of 0.2915 M NaOH to titrate 20.00 mL of sulfuric acid…

A: The reaction between Sulfuric acid (H2SO4) and Sodium hydroxide(NaOH) is given as:H2SO4 + 2 NaOH →…

Q: Calcium Chloride (CaCl,) freely dissolves in water by the following equation. 2+ CaCl, (s) → Ca“…

A: We have to find concentration of Cl-

Q: A 3.72 g sample of iron ore is transformed to a solution of iron(II) sulfate, FeSO4. This solution…

A: Given : Molarity of K2Cr2O7 = 0.110 M Volume of K2Cr2O7 = 60.9 ml. Reaction given :

Q: A chemist performs a gravimetric analysis. The chemist combines 1.00 L of 2.00 M AGNO3 (ag) with…

A: Given, AgNO3 solution Molarity of AgNO3 solution = 2.00 M = 2.00 mol/L Volume of AgNO3 solution =…

Q: A simulated seawater sample contains 0.571 M NaCl (aq) and 0.0583 M MgCl2 (aq). Assuming NaCl and…

A: Given, Molarity of NaCl = 0.571M. Molarity of MgCl2 = 0.0583M. The dissociation of NaCl and MgCl2…

Q: How many milliliters of 10.5 M HCl(aq) are needed to prepare 460.0 mL of 1.00 M HCl(aq)?

A: We have to find the volume for dilution.

Q: How many moles of sulfuric acid,H2SO4, are neutralized by 23.46 mL of 0.238 M NaOH(aq)? Begin by…

A: The neutralization reaction of H2SO4 by NaOH takes place forming salt and water. It can be expressed…

Q: How many milliliters of 12.0 M HCl(aq) are needed to prepare 710.0 mL of 1.00 M HCl(aq)?

A: Given --> M1 = 12.0 M  V1 = ? M2 = 1.00 M  V2 = 710 ml

Q: When 250.0 milliliters of an aqueous solution of hydrochloric acid is reacted with an excess of…

A:

Q: Thallium(I) sulfate is an active ingredient in rat poison. We can analyze a sample for the mass…

A:

Q: A solution of NaCl(aq) is added slowly to a solution of lead nitrate, Pb(NO3)₂(aq), until no further…

A: Answer: In this question we have to convert the mass of PbCl2 into moles of Pb(NO3)2 to find out its…

Q: 5.00 mL of 2.5 M NaCl(aq) is diluted with water to the calibration line in a 100.00 mL volumetric…

A: Since the dilution is happening by adding water only  Hence the moles of NaCl taken initially should…

Q: References A 3.41 g sample of iron ore is transformed to a solution of iron(II) sulfate, FeSO4. This…

A:

Q: A student takes a 25.0 mL volume from a stock solution of 1.14 mol L-1 magnesium chloride. How many…

A:

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.