Q1: Write the balanced molecular reaction and the net ionic reaction for the rea
ID: 955731 • Letter: Q
Question
Q1: Write the balanced molecular reaction and the net ionic reaction for the reaction between BaCl2 and Na3PO4 in aqueous solution: Molecular reaction:
____BaCl2(aq) + ____Na3PO4(aq) ____ ___________ + ____ __________
Net ionic reaction:
Q2: Classify the following reactions as: acid-base, precipitation, combustion, combination, and displacement or disproportionation reaction:
BaCl2(aq) + MgSO4(aq) BaSO4(s) + MgCl2(aq) __________________________ reaction
NH3(aq) + HBr(aq) NH4Br(aq) _______________________________
reaction 2CO(g) + O2 2CO2(g) _______________________________ reaction
Q3: Circle the correct answer for each
CO32– is a Brønsted acid / Brønsted base / can be both
HCO3– is a Brønsted acid / Brønsted base / can be both
PO43– is a Brønsted acid / Brønsted base / can be both
H3PO4 is a Brønsted acid / Brønsted base / can be both
H2PO4– is a Brønsted acid / Brønsted base / can be both
CH3COOH is a Brønsted acid / Brønsted base / can be both
CH3COO– is a Brønsted acid / Brønsted base / can be both
SO42– is a Brønsted acid / Brønsted base / can be both
Q4: The oxidation numbers of S in SO32– and,SO42– are:
A. +2 and + 4 B. +3 and +6 C. +4 and +6 D. +6 and +8 E. –4 and –6
Q5: The oxidation number of Cr in the dichromate ion, Cr2O72– is:
A. +6 B. +5 C. +4 D. –4 E. +7
Q6 For which of the following pairs are both compounds insoluble in water?
A.NaBr, Na2SO4
B. Na2CO3, CaCO3
C. Fe2(CO3)3, Ba3(PO4)2
D. Na3PO4, Ca3(PO4)2
E. PbSO4, MgSO4
Explanation / Answer
3BaCl2 + 2Na3PO4 ---->Ba3(PO4)2 + 6NaCl
3Ba+2 +6Cl-+ 2PO4-2 + 6Na+ -----> Ba3(PO4)2 +6Na+ 6Cl-
net onic equation 3Ba+2 + 2PO4-2 -----> Ba3(PO4)2
2. BaSO4 gets precipitated. Hence precipitation reaction
3. NH3 (base)+ HBr( acid) ----> NH4Br acid base reaction
4. 2CO+ O2----> 2CO2 is combustion reaction.
5he
Brønsted-Lowry definition of an acid is a substance capable of donating a proton (H + ), and a base
is a substance capable of accepting a proton
5. CO32- is base. As it cant donate any proton(i.e hydrogen ions).
6. HCO3- is conjugate base of H2CO3 but it can donoate H+ and becomes CO3-2. Hence it is an acid as well as base.
6. PO4-3 is base
7. H3PO4 is acid
8. H2PO4- is acid as well as base. since it can loose proton and also accepts proton to become H3PO4.
9. CH3COOH is acid
10. CH3COO- is base.
11. SO4-2 is base.
12. 3 oxygen atoms are there and hence total charge is -6 and there is -2 charge on SO4-2
x-6= -2 x=4 similarly for SO4-2 = x-8= -2 x= 6 so oxidation numbers are +4 and +6
13.x*2+2*(-7)= -2
x=6 the oxidation number of chromium ins Cr2O7-2 is +6
14. Fe2(CO3)3 and Ba3(PO4)2 are insoluble in water.
6.
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