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3 years ago

8

a container of plant food recommends an appilcation rate of 630g/ha. If the container holds 15kg of plant food, how many square

meters will it cover? (1 ha=10000 m^2)

1 answer:

IceJOKER [234]3 years ago

8 0

Answer:
50 kg \ 10,000 m2 = 0.005 kg\m2
so 10 kg \ 0.005 = 2000
so for each 10 kg covers 2000 m2
keeping in mind each square meter gets 0.005 kg of the strong food
so how many 0.005 kg are in 10 kg`s ? , the answer is 2000 and thats the number of square meters.

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Question 2 Calculate the pH of a solution that has an acetic acid concentration of 0.05 M and a sodium acetate concentration of

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Read 2 more answers

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Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

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n = moles of solute

$V_s$ = volume of solution in ml

moles of $Ba(OH)_2$ = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{0.867g}{171g/mol}=0.00507mol$ (1g=1000mg)

Now put all the given values in the formula of molality, we get

$Molarity=\frac{0.00507\times 1000}{170}$

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pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

$pOH=-\log [OH^-]$

$Ba(OH)_2\rightarrow Ba^{2+}+2OH^{-}$

According to stoichiometry,

1 mole of $Ba(OH)_2$ gives 2 mole of $OH^-$

Thus 0.0298 moles of $Ba(OH)_2$ gives = $\frac{2}{1}\times 0.0298=0.0596$ moles of $OH^-$

Putting in the values:

$pOH=-\log[0.0596]=2.82$

$pH+pOH=14$

$pH=14-2.82$

$pH=11.2$

Thus the pH of the solution is 11.2

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3 years ago