4.104 are stronger and harderanetppr bronze. Bonzes tin alone ta. A 100 0-g samp

Question

4.104

are stronger and harderanetppr bronze. Bonzes tin alone ta. A 100 0-g sample of a certain bronze is90 0% copper by mass and 10 0% t in which metal can be called the solvent, and which the solute? (h) Based on part (a), calculate the concentration of the solute metal in the alloy in units of molarity, assuming a density of 7.9 g/em. (e) Suggest a reac- tion that you could do to remove all the tin from this bronze to leave a pure copper sample. Justify your reasoning. 4.99 A 35.0 ml sample of 1.00 M Co(NO), and an 80.0-mL sample of 0.600 M Co(NO), are mixed. The solution is then heated to evaporate water until the total volume is 50.0 ml. Calcu- late the volume, in ml, of 0.20 M H,PO, that is required to 4.1 precipitate out cobalt (dlI) phosphate in the final solution. 4.100 Neurotransmitters are molecules that are released by nerve cells to other cells in our bodies, and are needed for muscle motion, thinking, feeling, and memory. Dopamine is a com- mon neurotransmitter in the human brain. Integrative Exercises 4.105 Suppose you have 3.00 g of powdered zinc metal, 3.00g of

Explanation / Answer

Concentration of Co3+ in the mixture = [(1.00*35.0) + (0.600*80.0] / (35.0 + 80.0) = 0.723 M

Now, using dilution formula,

M1V1 = M2V2

0.723 * 115. = M2 * 50.0

M2 = Final concentration of Co3+ after heating = 1.66 M

Balanced equation,

Co3+ (aq.) + H3PO4 (aq.) -----------------> CoPO4 (s) + 3 H+ (aq.)

Formula,

M1 * V1 / n1 = M2 * V2 / n2

1.66 * 50.0 / 1 = 0.20 * V2 / 1

V2 = Volume of phosphoric acid required = 416. mL

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