The solubility of an unknown substance was tested three times during an experiment. Based on the solubility curve shown and the results of the experiment, what is most likely the identity of the substance? Select one: O sodium nitrate о potassium chloride O potassium nitrate O sodium chloride Solubility (grams of solute/100 g H₂0) 120 110 100 90 80 70 60 50 40 30 20 10 NaNO₂ SONY KCI NaCl 10 20 30 40 50 60 70 80 90 100 Temperature (°C) Mass of Unknown Solute That Dissolves in 100 g Water 50°C Trial 1 2 40°C 63.2 g 80.2 g 30°C 46.0 g 45.9 g 44.3 g 45.4 9 81.3 g 61.4 g 62.9 g 62.5 g 3 Average 79.8 g 80.4 g

Equal volumes of Solutions 2 and 3 were mixed in the lab. Suggest a measurement that could be made in the lab to provide evidence that a chemical reaction occurred when Solutions 2 and 3 were mixed.

A chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 8.25 g • She put some solid sodium thiosulfate into the graduated cylinder and weighed it. With the sodium thiosulfate added, the cylinder weighed 18.845 g. • She added water to the graduated cylinder and dissolved the sodium thiosulfate completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 177.59 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits.

A reaction is made up in the following way: 16 mL of 4.3 M acetone + 16 mL of 1.1 M HCI + 16 mL of 0.0058 M I2 + 14 mL of water. What was the inital concentration of I2 in the reaction mixture? Express your answer as a decimal number (no exponents). Please include proper (abbreviated) units.

A chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 6.0 g • She put some solid sodium thiosulfate into the graduated cylinder and weighed it. With the sodium thiosulfate added, the cylinder weighed 94.86 g. • She added water to the graduated cylinder and dissolved the sodium thiosulfate completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 122.28 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. 山。 g.mL 1 x10 X Ś

A student weighs out a 12.8 g sample of Ni(NO3)2, transfers it to a 300. mL volumetric flask, adds enough water to dissolve it and then adds water to the 300. mL tick mark. What is the molarity of nickel(II) nitrate in the resulting solution? Molarity =  ______M

Use the solubility chart below to answer the following question: A beaker filled with 100 g of water is saturated with NH4Cl at 70 °C. If this solution is cooled to 50 °C, what mass of NH4Cl will precipitate out of solution?

Consider a solution prepared by combining 45.0 g of BaCl2 with enough water to prepare a 750.0 mL of solution.  Assume that the volume of water added was 748 mL.  Density of water is 1.00 g/mL.  1)  What volume of this solution would be required to prepare 500.0 mL of a solution that is 0.0034 M in BaCl2?

An analytical chemist weighs out 0.061 g of an unknown monoprotic acid into a 250 mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.1900 M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 3.3 mL of NaOH solution. Calculate the molar mass of the unknown acid. Round your answer to 2 significant digits. g 0 x10 mol C X Ś 2.

What is the concentration, in ppm, if 0.008080 grams of CaCl2 is dissolved in water to a total solution volume of 250.0 ml? This solution has a density of 1.00003 g/mL.