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2 years ago

What is sodium bicarbonate an example of? a buffer an acid a liquid a base

Chemistry

1 answer:

ludmilkaskok [199]2 years ago

3 0

Answer:

base

Explanation:

carbonic acid - H2CO3 - is a weak acid. Therefore, HCO3 itself is its conjugate base. The Na(sodium) ion is neutral.

This means that NaHCO3 is a base. (a weak one)

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describe the independent and dependent variables in this experiment then describe the other variables that need to be controlled

uranmaximum [27]

independent variable is being controlled and the dependent variable is being tested and being easured in a scientific experiment

3 0

2 years ago

Sodium phosphate and calcium chloride react to form sodium chloride and calcium phosphate. If you have 379.4 grams of calcium ch

barxatty [35]

Answer: 353.6 g.

Explanation:

1) Word equation (given)

Sodium phosphate + calcium choride → sodium chloride + calcium phosphate

2) Balanced chemical equation

2 Na₃PO₄ +3 CaCl₂ → 6 NaCl + Ca₃(PO4)₂

3) Mole ratio

2 moles Na₃PO₄ : 3 moles CaCl₂ : 6 moles NaCl : 1 mole Ca₃(PO4)₂

4) Formula to convert grams to moles

number of moles = mass in grams / molar mass

5) Number of moles of limiting reactant

a) mass in grams = 379.4 g CaCl₂

b) molar mass CaCl₂ = 110.98 g/mol

c) number of moles CaCl₂ = 379.4 g / 110.98 g/mol = 3.419 moles

6) Theoretical yield of Ca₃(PO4)₂

3 moles CaCl₂ / 1 mole Ca₃(PO4)₂ = 3.419 moles CaCl₂ / x ⇒

x = 3.419 × 1 / 3 = 1.140 moles Ca₃(PO4)₂

7) Convert 1.140 moles Ca₃(PO4)₂

a) molar mass Ca₃(PO4)₂ = 310.1767 g/mol

b) mass in grams = number of moles × molar mass = 1.140 moles × 310.1767 g/mol = 353.6 g ← answer.

7 0

3 years ago

True or False: The solute is ALWAYS a solid and the solvent is ALWAYS a liquid

sasho [114]

Answer:

false

Explanation:

Note that the solvent is the substance that is present in the greatest amount. Many different kinds of solutions exist. For example, a solute can be a gas, a liquid or a solid. ... Note that in each case, the solute particles are uniformly distributed among the solvent particles.

7 0

2 years ago

Read 2 more answers

How many grams of Fe2O3 are formed when 16.7 moles of Fe reacts completely with

lesantik [10]

Answer:

The answer to your question is 1) 1336 g of Fe₂O₃ 2) 1 mol of H₃PO₄

Explanation:

Data

mass of Fe₂O₃ = ?

moles of Fe = 16.7

Balanced chemical reaction

4Fe + 3O₂ ⇒ 2Fe₂O₃

a.- Calculate the moles of Fe₂O₃

4 moles of Fe ----------------- 2 moles of Fe₂O₃

16.7 moles of Fe -------------- x

x = (16.7 x 2)/4

x = 33.4/4

x = 8.35 moles of Fe₂O₃

b.- Calculate the molar mass of Fe₂O₃

Fe₂O₃ = (2 x 56)+ (3 x 16) = 112 + 48 = 160 g

c.- Convert moles to mass

160 g of Fe₂O₃ ------------ 1 mol

x ------------ 8.35 moles of Fe₂O₃

x = (8.35 x 160)/1

x = 1336 g of Fe₂O₃

moles of H₃PO₄ = ?

mass of P₄O₁₀ = 71 g

Balanced chemical reaction

P₄O₁₀ + 6H₂O ⇒ 4H₃PO₄

a.- Calculate the molar mass of P₄O₁₀

P₄O₁₀ = (31 x 4) + (16 x 10) = 124 + 160 = 284 g

b.- Convert the mass of P₄O₁₀ to moles

284 g ------------------- 1 mol

71 g -------------------- x

x = (71 x 1)/284

x = 0.25 moles of P₄O₁₀

c.- Calculate the moles of H₃PO₄

1 mol of P₄O₁₀ ---------------- 4 moles of H₃PO₄

0.25 moles ----------------- x

x = (0.25 x 4) / 1

x = 1 mol of H₃PO₄

3 0

3 years ago

How many ions are present if 2.0 moles of hno3 are completely dissolved in water?

Arte-miy333 [17]

Nitric acid(HNO3) is a strong acid so most of its component will dissociate into an ion form. When dissolved into water, nitric acid will have this reaction
HNO3= 1 H $^{+}$ + NO3 $^{-}$

For every 1 mol of HNO3, there will be 1 mol of H+ ion and NO3- ion formed, which makes a total of 2 ions(degree of dissociation = 2).
Then for 2 moles of HNO3 it would be: 2 moles * 2= 4 moles of ion

5 0

3 years ago

Read 2 more answers