A chemistry student must write down in her lab notebook the concentration of a s

Question

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: She put some solid sodium thiosulfate into the graduated cylinder and weighed it. With the sodium thiosulfate added, the cylinder weighed 62.41 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 35.30 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits.

Explanation / Answer

mass of sodiumthiosulfate + cylinder = 62.41gm

mass of empty cylider                          = 6.5gm

mass of sodiumthiosulfate                     =62.41-6.5 = 55.91gm

concentration of sodium sulfate = 55.91gm/35.3ml = 1.584gm/ml

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.