Calculation of the number of grams of salt and water of 10 grams of eye drops, if the weight of the salt in the solution is 0,25%

See Explanation

Explanation:

Let the mass of salt be x

Let the mass of solution be 10 g

Percentage by mass of salt = 0,25%

So;

Percent concentration of salt = mass of salt/mass of solution * 100

0.25 = x/10 * 100

0.25 * 10/100 = x

x= 0.025 g of salt

Let the mass of water be y

Since mass of solution = mass of salt + mass of water

10 g = 0.025 g + y

y = 10 g - 0.025 g

y = 9.975 g

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when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.