Answer:
=60 milligrams
Explanation:
12 x 5
=60 milligrams
Have a nice day!!!!!!! :-)
<u>KA</u>
Answer:
B. II.
Explanation:
The idea of recrystallization works when the solubility of the target substance decreases as the temperature of the solution decreases.
The method of recrystallization involves dissolving the solute in a suitable hot solvent and then allow the solution to cool gradually. The pure solute dissolves in the hot solvent and then separates out of the solution as it is cooled to room temperature.
Hence recrystallization is preferred over solvent extraction when the desired compound is poorly soluble in the solvent pair at low temperatures and greatly soluble in the solvent pair at high temperatures.
Why would you ask a question if you didnt have a question?
Just get someone to report it, and itll be deleted
<span>9.79 mL
Both HCl and HBr are neutralized by NaOH on a mole per mole basis. So a constant volume of a sodium hydroxide solution will neutralize the same number of moles of either HCl or HBr. So here are the equations to represent what we know and what we want. X = molarity of the Sodium Hydroxide solution and Y = volume of HBr solution to be neutralized.
13.1 * 0.293 = 7.89 * X
Y * 0.765 = 15.4 * X
Solve the first equation for X.
13.1 * 0.293 = 7.89 * X
3.8383 = 7.89 * X
0.486476553 = X
Now substitute the known value of X into the 2nd equation and solve for Y.
Y * 0.765 = 15.4 * 0.486476553
Y * 0.765 = 7.49173891
Y = 9.793122758
Round to 3 significant figures, getting 9.79 ml</span>
Answer:
true
Explanation:
Polyatomic ions are covalent compounds that have an overall charge. In the ammonium ion, NH4 , nitrogen is covalently bonded (shares electrons)to four separate hydrogen atoms
