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Mrac [35]
2 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)
Chemistry
1 answer:
IceJOKER [234]2 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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What do scientist do to easily share measurement data they can understand
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1. They use the same measuring system (metric)

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3 0
3 years ago
Question 2 Calculate the pH of a solution that has an acetic acid concentration of 0.05 M and a sodium acetate concentration of
Eva8 [605]

Answer : The pH of the solution is, 4.9

Explanation : Given,

Dissociation constant for acetic acid = K_a=1.8\times 10^{-5}

Concentration of acetic acid = 0.05 M

Concentration of sodium acetate = 0.075 M

First we have to calculate the value of pK_a.

The expression used for the calculation of pK_a is,

pK_a=-\log (K_a)

Now put the value of K_a in this expression, we get:

pK_a=-\log (1.8\times 10^{-5})

pK_a=5-\log (1.8)

pK_a=4.7

Now we have to calculate the pH of buffer.

Using Henderson Hesselbach equation :

pH=pK_a+\log \frac{[Salt]}{[Acid]}

pH=pK_a+\log \frac{[CH_3COONa]}{[CH_3COOH]}

Now put all the given values in this expression, we get:

pH=4.7+\log (\frac{0.075}{0.05})

pH=4.9

Therefore, the pH of the solution is 4.9.

8 0
3 years ago
Un gas a una temperatura de 38°C, tienen un volumen de 21 Lts Litros. ¿Qué volumen tendrá si la temperatura sube a 67°C?.
djverab [1.8K]

Answer:

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Explanation:

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An atom that loses or gains electrons becomes a/an:
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Explanation:

4 0
3 years ago
Read 2 more answers
A chemist dissolves 867. mg of pure barium hydroxide in enough water to make up 170. mL of solution. Calculate the pH of the sol
Ilya [14]

Answer: The pH of the solution is 11.2

Explanation:

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}

where,

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}

Molarity=0.0298

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

8 0
3 years ago
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