Help to complete my calculated data using the recorded data above it Unknown num

Question

Help to complete my calculated data using the recorded data above it

Unknown number used Molarity of the EDTA solution Initial buret volume reading Buret volume at the color change (Final buret volume) Volume of Cu solution used Mass of Cu solution used (assume a density of 1.00 g/mL) Volume of EDTA used (Final minus initial volumes) moles of EDTA used (V times M)* moles of Cu present at start (equal to the EDTA moles above) Mass of Cu present at start (moles x atomic weight) % Cu by mass in unknown

Explanation / Answer

1. Mass of Cu solution used

Mass = Density * Volume

= 1 g/ml * 25 ml

= 25 g

2. Volume of EDTA used = Final volume - Initial volume

= 4.80 - 2.00

= 2.80 ml

3. Moles of EDTA used = Volume * Molarity

= (2.80 x 10-3) L * 0.1 M

= 2.8 x 10-4 moles

4. Moles of Cu present at start = Moles of EDTA = 2.8 x 10-4 moles

5. Mass of Cu present at start = Moles * Atomic Weight

= 2.8 x 10-4 moles * 63.5

= 0.01778 g

%Cu by mass in unknown = (Mass of Cu / Mass of Cu solution) * 100

= (0.01778 / 25) * 100

= 0.0711%

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---

---

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