Which example is a weak base? <br> ethyl alcohol, ammonia, potassium hydroxide or vinegar?

Explain how chewing your food thoroughly can help your body digest food.

posledela

If the food is in smaller chunks its easier for your stomach acids to break down then bigger pieces of food.

4 0

3 years ago

Read 2 more answers

How many liters of 0.98 M have solution would react completely with 3.5 moles ca(oh)2

jasenka [17]

The question is typed wrong. Assuming the correct question is

How many liters of 0.98 M H2SO4 solution would react completely with 3.5 moles Ca(OH)2 ?

Answer:-

3.571 litres

Explanation:-

The balanced chemical equation for this reaction is

H2SO4 + Ca(OH)2 = CaSO4 + 2 H2O

From the balanced chemical equation we see that

1 mole of Ca(OH)2 reacts with 1 mol of H2SO4.

∴3.5 moles of Ca(OH)2 reacts with 1 x 3.5 / 1 = 3.5 mol of H2SO4.

Strength of H2SO4 = 0.98 M

Volume of H2SO4 required = Number of moles of H2SO4 / Strength of H2SO4

= 3.5 moles / 0.98 M

= 3.571 litre

8 0

4 years ago

A mixture of helium and nitrogen gases, in a 7.03 L flask at 17 °C, contains 0.738 grams of helium and 8.98 grams of nitrogen. T

Andrei [34K]

Answer:

The partial pressure of nitrogen in the flask is 1.08 atm and the total pressure in the flask is 1.70 atm.

Explanation:

We must use the Ideal Gas Law to solve this:

Pressure . volume = n . R . T

T = T° in K → T°C + 273

17°C + 273 = 290K

n = moles

In a mixture, n is the total moles (Sum of each mol, from each gas)

Moles = Mass / Molar mass

Moles He = 0.738 g / 4g/m = 0.184 moles

Moles N₂ = 8.98 g / 28g/m = 0.320 moles

0.184 m + 0.320m = 0.504 moles

P . 7.03L = 0.504m . 0.082L.atm/ mol.K . 290K

P = (0.504m . 0.082L.atm/ mol.K . 290K) /7.03L

P = 1.70 atm - This is the total pressure.

To know the partial pressure of N₂ we can apply, the molar fraction:

Moles of N₂ / Total moles = Pressure N₂ / Total pressure

0.320m / 0.504m = Pressure N₂ / 1.70atm

(0.320m / 0.504m) . 1.70atm = Pressure N₂

1.08atm = Pressure N₂

8 0

4 years ago

The cation of the salt is sodium ion, and the anion is aurothiosulfate ion. Based on the chemical formula of the salt, what must

marta [7]

Answer:

3-

Explanation:

Sodium aurothiosulfate is a salt with the formula Na₃Au(S₂O₃)₂. The cation of the salt is sodium ion, and the anion is aurothiosulfate ion. We can determine the charge of the aurothiosulfate ion, considering that the sum of the positive and negative charges must be equal to the charge of the compound, which is zero.

3 × Na⁺ + 1 × Au(S₂O₃)₂ⁿ⁻ = 0

3 × +1 + 1 × Au(S₂O₃)₂ⁿ⁻ = 0

Au(S₂O₃)₂ⁿ⁻ = 3-

7 0

3 years ago

2. Why is it important in gravimetric analysis to add an excess amount of precipitating ions to a solution containing an analyte

Wewaii [24]

It is important in gravimetric analysis to add an excess amount of precipitating ions to a solution containing an analyte because it helps to determine the mass of the analyte.

<h3>What is Gravimetric analysis?</h3>

This is a method which is used in the determination of the quantitative determination of the ion being analyzed(analyte) based on its mass.

Adding an excess amount of precipitating ions to a solution containing an analyte will make it easier for the mass of an analyte to be determined.

It is also important for the precipitate to be a pure substance with a definite and known composition which therefore makes it the most appropriate reason.

Read more about Gravimetric analysis here brainly.com/question/6163057

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8 0

2 years ago

Which example is a weak base? ethyl alcohol, ammonia, potassium hydroxide or vinegar?