Question

How to change 5 % W/V of NaCl to ppm , M ? molar mass = 58.5
please clear explain​

Answer 1

To change 5% W/V of NaCl to ppm, we calculate it as 50000 ppm. To convert it to molarity, we use the mass of NaCl and its molar mass to get a concentration of 0.855 M.

Step-by-step explanation:

To convert 5% W/V of NaCl to ppm, we use the fact that 5% W/V means 5 grams of NaCl in 100 mL of solution. Since 1 ppm is 1 mg/L, converting grams to milligrams and milliliters to liters, we have 50000 ppm (because 5 g = 5000mg and 100mL = 0.1L, so 5000 mg/0.1L = 50000 mg/L or 50000 ppm).

To convert to molarity (M), we use the molar mass of NaCl, which is 58.5 g/mol. Since 5% W/V is 5 g NaCl in 100 mL, to find moles we divide mass of NaCl by its molar mass (5 g ÷ 58.5 g/mol). Then, we convert 100 mL to liters to find molarity, which is moles of solute per liter of solution (0.0855 mol ÷ 0.1 L), thus the molarity is 0.855 M.

Answer 2

50000ppm and 0.855M.

Step-by-step explanation:

ppm is an unit of chemistry defined as the ratio between mg of solute (NaCl) and Liters of solution. Molarity, M, is the ratio between moles of NaCl and liters

A 5% (w/v) NaCl contains 5g of NaCl in 100mL of solution.

To solve the ppm of this solution we need to find the mg of NaCl and the L of solution:

mg NaCl:

5g * (1000mg / 1g) = 5000mg

L Solution:

100mL * (1L / 1000mL) = 0.100L

ppm:

5000mg / 0.100L = 50000ppm

To find molarity we need to obtain the moles of NaCl in 5g using its molar mass:

5g * (1mol / 58.5g) = 0.0855moles NaCl

Molarity:

0.0855mol NaCl / 0.100L = 0.855M