X | Y | Z | W | |
盐酸 | √ | — | — | √ |
Z的硝酸盐 | √ | |||
W的硝酸盐 | √ | — |
时间/s |
0 |
30 |
60 |
90 |
120 |
150 |
180 |
质量/g |
0 |
15 |
25 |
30 |
33 |
33 |
33 |
试完成下列问题: