Answer:
426 mg = 4.26 x 10² mg
Explanation:
1 cup = 237.6 mL x 1 L/1000 mL = 0.2376 L
We divide the liters of milk the student drinks into the volume in liters of a cup to calculate the number of cups the student drinks per day:
number of cups per day = 0.318 L/0.2376 L = 1.34 cup
Now, we multiply the number of cups by the amount of calcium that a cup of milk has:
amount of calcium = 1.34 cup x 318 mg = 426 mg = 4.26 x 10² mg
Therefore, the student gets 426 mg (or 4.26 x 10² mg) of calcium in one day.
Difference is in purity of reagents.
Ordinary reagent - reagents that can meet standard purity.
Analar reagent - chemical reagent of high purity with known contaminants for use in chemical analyses.
Industrial reagent - for <span>commercial and industrial purposes, not pure enough.</span>
Answer:
The pH of the solution increases.
Explanation:
Acetic acid is a weak acid, this means it does not dissociate completely in aqueous solution.
Sodium acetate on the other hand is a salt which dissociates to give acetate ions ad sodium ion.
Also, sodium acetate is the conjugate base of acetic acid. A mixture of a weak acid and its conjugate base is a buffer solution.
The mixture leads to a greater concentration of acetate ion, CH3COO-. shere is an increase in the pH of the solution.
So, when you are adding sodium acetate to a solution of acetic acid, concentration of acetate anions increases. Thus, there will be a decrease of hydronium ions resulting in pH increase.