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A piece of iron wire of mass 2.225g was put into a conical flask containing dilute sulphuric acid. The flask was fitted with a bung carrying a Bunsen valve, to allow the hydrogen generated to escape but preventing air from entering. The mixture was warmed to speed up the reaction. When all the iron had reacted, the solution was cooled to room temperature and made up to 250cm^3 in a graduated flask. With all these precautions, iron is converted to Fe^2+ ions only and no Fe^3+ ions are formed. 25.0cm3 of the solution were acidified and titrated against a 0.0185 mol/dm^3 solution of potassium dichromate (VI). The volume required was 31.0cm^3. Calculate the percentage of iron in the iron wire.
a 200-g sample of a metal absorbs 500 J, and its temperature rises by 30 degrees celsius. what is the specific heat of the metal?
what is the molarity of a solution prepared by dissolving 15.07 g of hcl in enough water to make 920.72 ml of solution?
What is the minimum concentration of ammonia that should dissolve AgBr to produce a 0.01 M Ag(NH3)2+ solution
You add 1.0mL of 1.00 M HCl to the buffer. Calculate the molarity of H3O+ added as HCl, and the final molarities of acetic acid and acetate ion at equilibrium. what is the new value of pH
Reactions of alcohols with hydrogen halides yield the important class of compound known as alky halides. Reactivity towards the hydrogen halides with an alcohol decreases
when sodium is heated a yellow spectral line whose energy is 3.37x1019 jphoton is produced. what is the frequency and
Blood contains several substances that minimize changes in its acidity by reacting with either an acid or a base. One of these is the hydrogen phosphate ion, HPO42-.
What volume of 0.205 M K3PO4 solution is necessary to completely react with 122mL of .0110M of NiCl2? 2K3PO4+3NiCl2=Ni3(PO4)2+6KCl
If R = 0.0821 liter-atmospheres/mole-degree K, the flask volume is 275 ml, the pressure is 775 torr., calculate the density of the vapor for CH2Cl2 at 75C 2.
A 1.35 m aqueous solution of compound X had a boiling point of 101.4 c. which one of the following could be compound X. the boiling point elevation constant for water is 0.52c/m A) kcl B) C6H12O6 C) CH3CH2OH D)Na3PO4 E) CaCl2
Table salt (NaCl) and sugar (C12H22O11) are accidentally mixed A 5.00g sample is burned and 2.20-g of CO2 are produced. What is the mass percentage of the table salt in the mixture.
What is the OH- in a solution that has a pH of 1.86? Give your answer to 3 significant figures using E-notation (i.e., 1 number before and 2 after the decimal point).
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