Wastewater from a cement factory contains 0.280 g of ca2+ ion and 0.0220 g of mg2+

The concentration of ions are 2.797 ppm and 0.212 ppm respectively.

Explanation:

To calculate the mass of solution, we use the equation:

Volume of gold = 100 L = 100000 mL    (Conversion factor:  1 L = 1000 mL)

Density of gold = 1.001 g/mL

Putting values in above equation, we get:

To calculate the concentration in ppm (by mass), we use the equation:

Calculating the concentration of calcium ions:

Mass of ions = 0.280 g

Putting values in above equation, we get:

Calculating the concentration of magnesium ions:

Mass of ions = 0.0220 g

Putting values in above equation, we get:

Hence, the concentration of ions are 2.797 ppm and 0.212 ppm respectively.

Cohesion is basically the attraction between molecules within a substance. I the case of water, the cohesion will definitely decrease with the increase in temperature. With the increase in temperature, the molecules will start vibrating more and the attraction among them will decrease. I hope the answer helps you.