Keiko needs 100ml of a 5% acid solution for a science experiment. she has available a 1% solution and a 6% solution. how many milliliters of the 1% solution and how many milliliters of the 6% solution should she mix to make the 5% solution?

20 ml of the 1% solution and 80 ml of the 6% solution should she mix to make the 100 ml of 5% solution

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. Concentration shows the amount of solute in a unit of the amount of solvent.

Molarity (M)

Molarity shows the number of moles of solute in every 1 liter of solution.

Where

M = Molarity

n = Number of moles of solute

V = volume of the solution

For molarity a mixture can be formulated  :

Keiko needs 100 mL of a 5% acid solution

The available solutions are 1% and 6%

We can make a mathematical equation from the two statements above

The total volume of the 1% and 6% solutions is 100 ml

5% = 1% .V1 + 6% .V2 /( V1 + V2 )

5% = 1% .V1 + 6% .V2 / 100

5 = 1% .V1 + 6% .V2 or

500 = V1 + 6V2

Equations 1 and 2 we do elimination and substitution

500 = V1 + 6V2

100  = V1 + V2

----------------------- -

400 =  5V2

V2 = 80 ml

V1 = 20 ml

the concentrations for the two ions

link

The molarity of the stock solution of luminol

link

volume of 0.100 M Na₃PO₄

link

Keywords: reaction coefficients, potassium carbonate, electrolytes

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.