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andrezito [222]
2 years ago
13

which of these solutions has the highest concentration of h+?solution a, ph = 12.5solution b, ph = 7.0solution c, ph = 2.5

SAT
1 answer:
valkas [14]2 years ago
8 0

Answer:

for solution A

pH = 12.5

for solution B

pH = 7.0

for solution C

pH = 2.5

Explanation:

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Exactly 80 liters of 20% are needed.

Let quantity of 20% alcohol solution be added : x liters  

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> x*20% + 40 * 50% = (x+40) * 30%  

> x*0.2 + 40*0.5 = (x+40)*0.3 ..(converting percentages into decimal)  

> 0.2x + 20 = 0.3x + 12

> 20-12 = 0.3x - 0.2x (Rearranging similar terms)

> 8 = 0.1 x

Hence x = 8/0.1  

Ans 80 Litres

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Shalnov [3]

Answer:

Explanation:

If John needs to ensure a 40% profit, John needs to sell the pines at a price that would give 40% more money back than he spent.

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However, the question asks for the price of a single pine.  To find the unit price of a single pine, divide the total revenue by 15.

\frac{\$4900}{15pines}=\frac{\$326.\bar{6}}{pine}=\$326.66 \text{ per pine}

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