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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Waffles7 on February 10, 2017, 08:35:07 PM

Title: What is the concentration of 2% starch?
Post by: Waffles7 on February 10, 2017, 08:35:07 PM

I am doing a lab report that asks what the concentration of 2% starch is and I do not know how to answer. please help. I think it was a 5ml solution if that helps. I do not know how to solve so I cannot provide any work. I measured the weight of one drop of starch (0.038g)

Title: Re: What is the concentration of 2% starch?
Post by: Borek on February 11, 2017, 03:32:28 AM

Quote from: Beejsterb on February 10, 2017, 08:35:07 PM

what the concentration of 2% starch is

Please elaborate, as this question - as asked - doesn't make sense.

What is the length of a 1 meter rod?

How much does a 1 kg bag of sugar weigh?

What is the concentration of a 2% solution?

Title: Re: What is the concentration of 2% starch?
Post by: Babcock_Hall on February 11, 2017, 09:36:59 AM

I could be wrong about this, but I was under the impression that starch is a polymer of variable length (therefore, variable mass).  If that is true, I don't see how one could easily express its concentration in terms of molarity or molality.

Title: Re: What is the concentration of 2% starch?
Post by: AWK on February 11, 2017, 09:58:39 AM

Average molecular weight is used.