A chemist prepares a solution of iron(II) bromide (FeBr₂) by measuring out 21. g of iron(II) bromide into a 150. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's iron(II) bromide solution. Round your answer to 2 significant digits. 0 mol/L
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- A soft drink contains an unknown mass of citric acid, C3H5O(COOH)3. It requires 6.42 mL of 9.580 × 10−2-M NaOH to neutralize the citric acid in 10.0 mL of the soft drink. C3H5O(COOH)3(aq) + 3 NaOH(aq) → Na3C3H5O(COO)3(aq) + 3 H2O(ℓ) Determine which step in these calculations for the mass of citric acid in 1 mL soft drink is incorrect? Why? n (NaOH) = (6.42 mL)(1L/1000 mL)(9.580 × 10−2 mol/L) n (citric acid) = (6.15 × 10−4 mol NaOH) × (3 mol citric acid/1 mol NaOH) m (citric acid in sample) = (1.85 × 10−3 mol citric acid) × (192.12 g/mol citric acid) m (citric acid in 1 mL soft drink) = (0.354 g citric acid)/(10 mL soft drink) Determine the correct result.1.87 A solution of ethanol in water has a volume of 54.2 mL and a mass of 49.6 g. what information would you need to look up and how would you determine the percentage of ethanol in this solution?A chemist prepares a solution of silver(I) nitrate AgNO3 by measuring out 6.4102 x 10^2 μmol of silver(I) nitrate into a 450.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's silver(I) nitrate solution. Round your answer to 2 significant digits.
- A chemist prepares a solution of mercury(I) chloride (Hg2Cl2) by measuring out 0.00013μmol of mercury(I) chloride into a 50.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's mercury(I) chloride solution. Round your answer to 2 significant digits.A chemist prepares a solution of calcium bromide (CaBr2) by measuring out 3.4 x 102 μmol of calcium bromide into a 300.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's calcium bromide solution. Round your answer to 2 significant digits.A chemistry student weighs out 0.379g of citric acid H3C6H5O7, a triprotic acid, into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.2000M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Be sure your answer has the correct number of significant digits.
- A chemist must prepare 300.mL of 2.00M aqueous silver perchlorate AgClO4 working solution. He'll do this by pouring out some 5.62molL aqueous silver perchlorate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the silver perchlorate stock solution that the chemist should pour out. Round your answer to 3 significant digits.At a certain temperature, an aqueous solution is 38.0% H2SO4 by mass and has a density of 1.342 g/mL. What is the molarity of the solution?Provide your answer with 3 significant figures.A chemist prepares a solution of nickel(II) chloride NiCl2 by measuring out ×1.010^2μmolof nickel(II) chloride into a 350.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's nickel(II) chloride solution. Be sure your answer has the correct number of significant digits.
- A chemistry student weighs out 0.0763g of lactic acid HC3H5O3 into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.0500M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Be sure your answer has the correct number of significant digits.A sample of 18.11 grams of sodium hydroxide is weighed out on a balance and prepared to a volume of 2.00 x 102 mL in water. What is the molarity of this aqueous solution of NaOH? Express your answer to the correct number of significant figures and include the unit with your answer.A chemist prepares a solution of mercury(I) chloride (Hg2Cl2) by measuring out 0.000221μmol of mercury(I) chloride into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in μmol/L of the chemist's mercury(I) chloride solution. Round your answer to 3 significant digits.