Related questions with answers

What is the difference between a 10 % ( v / v ) methanol $(\mathrm{CH}_3 \mathrm{OH})$ solution and a $10 % ( m / m ) methanol solution?

To test for the presence of glucose, a student added the same amount of Benedict's solution to each of four test tubes. (Benedict's is a glucose indicator that is a royal blue color when no glucose is present. To determine if glucose is present, Benedict's must be mixed in the unknown solution and heated for several minutes.)

Two of the test tubes contained unknown solutions. The other two test tubes contained known solutions. The chart below shows the color results obtained after the solutions were heated in the four test tubes in a hot water bath.

Tube	Contents	Color After Heating
1	{:[" Unknown solution + "],[" Benedict's solution "]:}	Royal blue
2	{:[" Unknown solution + "],[" Benedict's solution "]:}	Red orange
3	{:[" Water + Benedict's "],[" solution "]:}	Royal blue
4	{:[" Glucose + water + "],[" Benedict's solution "]:}	Red orange

The student could correctly conclude that

(1) all of the tubes contained glucose

(2) tubes 1 and 2 contained glucose

(3) tube 1 did not contain glucose, but tube 2 did

(4) tube 2 did not contain glucose, but tube 1 did

The following graph shows the results of an experiment in which a cell was placed in a solution of glucose. The cell had no glucose in it at the beginning, and its membrane can transport glucose. Which of the following processes is/are illustrated by this experiment?
a. diffusion
b. saturation
c. competition
d. active transport

Question

What is the difference between a 5 % (m / m( glucose solution and a 5 % (m / v) glucose solution?

Solution

Verified

Answered 2 years ago

Step 1

1 of 2

$\textbf{Mass percent (m/m) concentration}$ is defined as the mass of solute in grams dissolved in 100 grams of solution.

$\textbf{Mass/volume percent (m/v) concentration}$ is defined as the mass of solute in grams dissolved in 100 mL of solution.

The 5 % (m/m) glucose solution consists of 5 grams of glucose dissolved in 100 grams of solution, while a 5 % (m/v) consists of 5 grams of glucose dissolved in 100 mL of solution.