Answer:
1.20 M (3 s.f.)
Explanation:
In this question, we are trying to find the concentration of KCl after dilution. Note that the number of moles of KCl does not change.
Number of moles of KCl
= 44.7 ÷74.55
= 0.59960 mol (5 s.f.)
New volume
= 500 mL
= (500 ÷1000) L
= 0.5 L
Concentration after dilution
= 0.59960 ÷0.5
= 1.1992 mol/L
= 1.20 M (3 s.f.)
* M is the symbol for Molarity, which is also equal to mol/L
Answer:
NaCN- basic salt
KNO3 - neutral salt
NH4Cl - acid salt
NaHCO3 - acid salt
Na3PO4 - acid salt
Explanation:
Salt hydrolysis a process by which salts react with water giving an acid and a base.
When we dissolve NaCN in water, we have;
NaCN + - ⇄ Na^+ + CN^-
KNO3 ------> K^+ + NO3^-
NH4Cl ------> NH4^+ + Cl^-
NaHCO3 -----> Na^+ + HCO3^-
Na3PO4 ----> 3Na^+ + PO4^3-
Note that if a salt is formed from a weak acid and a strong base, the salt will be a basic salt e.g NaCN formed from weak HCN and strong NaOH.
If a salt is formed from a strong acid and weak base, the salt will be acidic, e.gNH4Cl formed from weak NH3 and strong HCl.
If a salt is formed from a strong acid and strong base, the salt will be neutral, e.g KNO3 formed from strong KOH and strong HNO3.
A is incorrect because, the carbon dioxide is being pushed up by the below mixture of baking soda and vinegar.
B is incorrect because the carbon dioxide gets pushed out of the bottle and joins the air around the bottle, adding carbon dioxide to the air around the bottle.
C is incorrect because the mass of the reactants, the baking soda and vinegar, is more then the carbon dioxide it creates.
D is correct because the mass of the reactants is more then the carbon dioxide it creates.
I hope this helps you. please mark brainliest, thank you :)
Answer:
6
Explanation:
The only numbers you count are the ones after the letter H. In this chemical formula there are two H's. If the H didn't have any number after it, it would be 1, but there is a 3 after the first H and a 3 after the other H. Therefore, there is 6 hydrogen atoms.
