---
title: When an acid and an alkali exactly cancel, they make water and a sal… — Alkalis and soda, and how they cancel acids · tree and pragmatics
description: When an acid and an alkali exactly cancel, they make water and a salt; most such salts are not for eating. Who acts: acid, Hydrangeas, most such salts. A sentence of the lesson «Alkalis and soda, and how they cancel acids» of the chemistry course of Mova's primary school with its dependency tree and
---

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# Alkalis and soda, and how they cancel acids, sentence 20

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When an acid and an alkali exactly cancel, they make water and a salt; most such salts are not for eating.

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**Who acts:** acid, Hydrangeas, most such salts · **What happens:** cancel, make, not be · **To what, where:** water

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This is a sentence of the lesson «Alkalis and soda, and how they cancel acids» of the chemistry course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (acid, Hydrangeas, most such salts), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:016-alkalis-and-soda.lesson:20
# text = When an acid and an alkali exactly cancel, they make water and a salt; most such salts are not for eating.
# source = school lesson (ours)
# course = chemistry
# lesson = 016-alkalis-and-soda.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1, R7-rel-agree ×1
1	When	when	SCONJ	WRB	_	8	mark	_	_
2	an	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
3	acid	acid	NOUN	NN	Number=Sing	8	nsubj	_	_
4	and	and	CCONJ	CC	_	6	cc	_	_
5	an	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	alkali	alkali	NOUN	NN	Number=Sing	3	conj	_	_
7	exactly	exactly	ADV	RB	_	8	advmod	_	_
8	cancel	cancel	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	11	advcl	_	_
9	,	,	PUNCT	,	_	11	punct	_	_
10	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	11	nsubj	_	_
11	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
12	water	water	NOUN	NN	Number=Sing	11	obj	_	_
13	and	and	CCONJ	CC	_	15	cc	_	_
14	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	_
15	salt	salt	NOUN	NN	Number=Sing	12	conj	_	_
16	;	;	PUNCT	,	_	11	punct	_	_
17	most	most	ADJ	JJS	Degree=Sup	19	amod	_	Agree=R5-strong|Haiku=18:advmod|HaikuPos=ADV:RBS:Degree=Sup
18	such	such	ADJ	JJ	Degree=Pos	19	amod	_	_
19	salts	salt	NOUN	NNS	Number=Plur	23	nsubj	_	_
20	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	23	cop	_	Agree=R7-rel-agree|Haiku=23:aux
21	not	not	PART	RB	Polarity=Neg	23	advmod	_	_
22	for	for	SCONJ	IN	_	23	mark	_	_
23	eating	eat	VERB	VBG	Tense=Pres|VerbForm=Part	11	parataxis	_	_
24	.	.	PUNCT	.	_	11	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **cancel** | present | a acid and a alkali |  |  |  |  | exactly *property* | tree rules |
| 2 | **make** | present | Hydrangeas *= hydrangea* | water and a salt |  |  |  |  | vn build-26.1-1 «NP.asset V NP»: agent=Asset water=Product |
| 3 | **not** **is** | present | most such salts |  |  |  |  | eat *property* | tree rules |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:chemistry:016-alkalis-and-soda.lesson:20`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1, R7-rel-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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