Molecular formula of starch can be represented as ( C 6 H 10 O 5 ) n . If the gold number of one such starch molecule is 6.48 and 0.01 millimoles of the above starch are required to be added t

Question

Molecular formula of starch can be represented as $(C_{6} H_{10} O_{5})_{n}$ . If the gold number of one such starch molecule is 6.48 and 0.01 millimoles of the above starch are required to be added to 10 ml of gold sol to prevent coagulation by 1 ml of $10%$ sodium chloride solution, then calculate the value of ' n '.

Answer:

4.00

Solution:

Gold number = (mg protective colloid / ml gold sol) / (ml 10% NaCl)

$6.48 = (0.01 \times n \times 162/10) /1$

$n = 4$

TestHub · Accepted Answer

Gold number = (mg protective colloid / ml gold sol) / (ml 10% NaCl) 6.48 = ( 0.01 × n × 162/10 ) /1 n = 4

Chemistry - Surface Chemistry Question with Solution | TestHub

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