Question

sodium hydroxide (naoh) and hydrochloric acid (hcl) combine to make table salt (nacl) and water (h₂o). which equation is balanced? (7 point) 2naoh + 2hcl → 2nacl + h₂o naoh + 2hcl → nacl + h₂o 2naoh + hcl → nacl + h₂o naoh + hcl → nacl + h₂o

Explanation:

Step1: Count atoms on both sides

For \( \text{NaOH} + \text{HCl}
ightarrow \text{NaCl} + \text{H}_2\text{O} \):

• Na: 1 atom on left (\( \text{NaOH} \)) and 1 atom on right (\( \text{NaCl} \)).
• O: 1 atom on left (\( \text{NaOH} \)) and 1 atom on right (\( \text{H}_2\text{O} \)).
• H: 1 + 1 = 2 atoms on left (\( \text{NaOH} + \text{HCl} \)) and 2 atoms on right (\( \text{H}_2\text{O} \)).
• Cl: 1 atom on left (\( \text{HCl} \)) and 1 atom on right (\( \text{NaCl} \)).

Step2: Check other options

• For \( 2\text{NaOH} + 2\text{HCl}

ightarrow 2\text{NaCl} + \text{H}_2\text{O} \):

• O: 2 atoms on left (\( 2\text{NaOH} \)) and 1 atom on right (\( \text{H}_2\text{O} \)) → Not balanced.
• For \( \text{NaOH} + 2\text{HCl}

ightarrow \text{NaCl} + \text{H}_2\text{O} \):

• Cl: 2 atoms on left (\( 2\text{HCl} \)) and 1 atom on right (\( \text{NaCl} \)) → Not balanced.
• For \( 2\text{NaOH} + \text{HCl}

ightarrow \text{NaCl} + \text{H}_2\text{O} \):

• Na: 2 atoms on left (\( 2\text{NaOH} \)) and 1 atom on right (\( \text{NaCl} \)) → Not balanced.

Answer:

\( \text{NaOH} + \text{HCl}
ightarrow \text{NaCl} + \text{H}_2\text{O} \)