answersLogoWhite

0


Best Answer

69

User Avatar

Wiki User

โˆ™ 2010-04-11 01:06:04
This answer is:
User Avatar
Study guides

Algebra

20 cards

A polynomial of degree zero is a constant term

The grouping method of factoring can still be used when only some of the terms share a common factor A True B False

The sum or difference of p and q is the of the x-term in the trinomial

A number a power of a variable or a product of the two is a monomial while a polynomial is the of monomials

โžก๏ธ
See all cards
3.74
โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…
1216 Reviews

Add your answer:

Earn +20 pts
Q: If in 30 liters of a solution 90 percent is alcohol then how much water needs to b added to make it 80 percent?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

How many liters of a 20 percent solution of acid should be added to 10 liters of a 30 percent solution of acid to obtain a 25 percent solution?

10 liters.


How many liters of water must be added to 30 liters of 20 percent ALCOHOL solution to dilute it to a15 percent solution?

You have 6 litres of alcohol in 24 litres of water You need to add x litres to make 6 equal to 15% of 30 + x. 6 is 15% of 40, so x = 10


How much water must be added to 12 L of a 40 percent solution of alcohol to obtain a 30 percent solution?

4 litres


How many liters of a 20 percent alcohol must be mixed with 40 liters of a 90 percent solution to get a 60 percent solution?

Let L be the liters to be added. Then (L) x (0.2) + (40 x 0.9) = (L + 40) x 0.6 0.2L + 36 = 0.6L + 24 36 - 24 = (0.6 - 0.2)L 12 = 0.4L L = 12/0.4 = 120/4 = 30 Liters


How much water must be added to 300 liters of a solution so that its concentration change from 25 percent to 20 percent?

75 litres


How many ml of water should be added to 95 percent ethyl alcohol to make 1 liter of a 30 percent ethyl alcohol solution?

684 ml


How many liters of a 30 solution should be added to a 90 solution to make 18 liters of a 75 solution?

4.5 litres of a 30% solution to the appropriate quantity of the 90% solution.


How much water should be added to four liters of 75 percent alcohol to make a mixture of 30 percent alcohol?

There are 3 litres of alcohol in your starting mixture of 4 litres. If you add 6 litres of water you will have 3 litres of alcohol in a total of 10 litres. This is the required strength.


How much of a ten percent solution should be added to two cups of twenty percent solution to make a twelve percent solution?

2%


How much water must be added to 40ml of a 25 percent by weight solution to make a 2 percent by weight solution?

About 80ml of water must be added to 40ml of a 25 percent by weight solution to make a 2 percent by weight solution.


How much water must be added to 40 ml of a 25 percent by weight solution to make a 2 percent by weight solution?

About 80ml of water must be added to 40ml of a 25 percent by weight solution to make a 2 percent by weight solution.


How much pure alcohol must be added to 7 liters of 10 percent alcohol solution to increase the concentration to 30 percent alcohol?

2 litersLet X represent the amount of pure alcohol to be added to the 7 liters of 10% alcohol solution to get a 30% alcohol solution. We want .3(7+x)=.1*7+x [because we need the alcohol in the final solution to equal the amount of alcohol in the original solution plus the amount of alcohol we are adding). Solving for x, we get:.3(7+x)=.1*7+x2.1+.3x=.7+x1.4=.7x2=xThus, 2 liters of pure alcohol needs to be added to the solution.Added noteto deal with the so called 'dilution contraction' of total volumeIf it were % by MASS ( %m/m), it's quite easy to do (based on the 'Mass Conservation Law). You calculate with mass (kg) and mass-% (%m/m) i.s.o. volume (L) and vol% (%v/v).However if the meaning was: % by Volume ( %v/v) then calculation appears to become quite complicated, but not impossible if you know at least the density values of all solutions (original 100%v/v or 10%v/v and final 30%v/v).DO NOT use: (orig. volume) + (added volume) = final volume, as done above, if exact figures are necessary.It's only a rule of thump, an approximation. This is because fluids can contract on mixing at dilution. There is no rule such as: conservation of volume.Your case: 7 L + 2 L (is not equal but) < 9 L final solution.

People also asked